Tier 1, 2 and 3 words: choosing which vocabulary to teach

By the IEP Atlas editorial teamLast updated November 1, 2026

Short answer

Tier 2 vocabulary words are useful words that show up across many subjects and in written text more than in conversation, such as reluctant, compare, consequence and fortunate. Tier 1 words are everyday words most students know; Tier 3 words belong to one subject, like photosynthesis. Tier 2 words usually give the most return for teaching time.

The three-tier framework is a widely used way to sort words when deciding which ones to teach. It does not rank words by difficulty. It sorts them by how often a student will meet them and where.

The tables below define each tier with examples, give a quick test for picking words, and clear up a common mix-up with MTSS tiers. A fictional 4th grade case shows how the choice plays out. For how vocabulary fits with comprehension work, see the cluster pillar on reading comprehension strategies.

The three tiers

Tier	What it is	Examples	Usually taught how
Tier 1	Everyday words most students learn through conversation	happy, dog, run, house, big	Rarely taught directly, except to English learners or students with language disorders
Tier 2	General academic and literary words used across subjects, more common in writing than in talk	reluctant, compare, analyze, fortunate, despite, establish	Taught directly with examples and repeated practice
Tier 3	Words tied to one subject or field	photosynthesis, isotope, legislature, denominator	Taught when the unit needs them, often with visuals

The tiers are not fixed for every student. "Hesitate" may be Tier 1 for a student from a word-rich home and new to a classmate. For an English learner, some Tier 1 words need teaching too, though many already know the concept in their first language.

A 4-question test for Tier 2 words

When you look at a text, ask these four questions of each candidate word:

Will the student meet it again in other texts and subjects?
Can I explain it in words the student already knows? If not, it may be a Tier 3 concept that needs a full lesson.
Does the text depend on it? Prioritize words a student must know to follow the passage.
Does it give a more precise way to say something the student already understands? "Furious" for "really mad" is a classic Tier 2 gain.

Words that pass all four are strong choices. Most texts yield 5 to 10.

Tier 2 word examples by grade band

Grade band	Sample Tier 2 words
K to 2	curious, gather, enormous, protect, notice, exhausted, gentle
3 to 5	reluctant, fortunate, observe, compare, frequently, consequence, cautious
6 to 8	analyze, significant, establish, contrast, perspective, inevitable, justify
9 to 12	contradict, implication, ambiguous, substantial, advocate, sustain, undermine

These lists are starting points. The best words come from the texts the student will actually read.

Vocabulary tiers vs MTSS tiers

The same word "tier" means two different things in schools, and IEP teams mix them up.

	Vocabulary tiers (1, 2, 3)	MTSS or RTI tiers (1, 2, 3)
What is sorted	Words	Levels of instructional support
Tier 2 means	Useful academic words across subjects	Small group intervention added to core instruction
Who uses it	Teachers and SLPs choosing words to teach	Teams deciding how much support a student gets
Set by	Teacher judgment, using the text	District MTSS model; RTI and MTSS designs vary by state and district

A student can receive Tier 3 MTSS intervention that teaches Tier 2 words. Spell it out in IEP notes so families are not confused.

Scenario: choosing words for one student

Student (fictional): Nia, grade 4, has an IEP for a language disorder. She reads grade 3 text with 96% accuracy but misses most vocabulary questions.

September 22. The SLP and the special educator looked at the next class read-aloud, a 1,200-word chapter. They listed 22 unfamiliar words. Using the 4-question test, they sorted them:

Tier 1 (skip): 4 words Nia already knew when asked.
Tier 3 (teach briefly with a picture): 5 words, such as "canyon" and "mesa."
Tier 2 candidates: 13 words. They kept the 7 that the chapter depended on and that Nia would meet again: reluctant, cautious, gradually, glimpse, determined, scarce, abandon.

Baseline, September 22 to 26. On 3 probes, Nia explained or gave a fitting example for 1, 0 and 1 of the 7 words in new sentences. Median 1 of 7.

Goal. Given taught Tier 2 words in unfamiliar sentences, Nia will answer questions that use the words correctly (for example, "Would a cautious person run across an icy street?") for 8 of 10 words on 3 consecutive weekly probes. See the template to answer questions that use taught Tier 2 words.

By November 21, after 8 weeks with 7 new words a week and cumulative review, Nia answered 8 or 9 of 10 on three probes in a row. Her class read-aloud questions improved from about half correct to most correct, which the team noted as a sign the words were transferring.

Rules and options that vary

Decision	Common practice	Varies by state or district?
Where word lists come from	The texts the student will read	Some districts publish academic word lists; many do not
How vocabulary appears in standards	Standards ask students to learn general academic and domain-specific words	Wording varies by state standards
Vocabulary on state tests	Word meaning in context, often as part of a passage	Item formats vary by state
Who teaches vocabulary on an IEP	Special educator, SLP or both	Service models and SLP roles vary
Tier 2 intervention under MTSS	Small group added to core	MTSS models vary by district

Teaching and measuring the words

The What Works Clearinghouse adolescent literacy guide recommends explicit vocabulary instruction, with words taught directly and used repeatedly in different contexts.^[1] The National Reading Panel reached a similar view: repeated exposure across contexts helps students learn new words.^[2]

Once you have the words, teach each with a student-friendly definition and examples, using the routine in explicit vocabulary instruction. Practice and review ideas are in vocabulary interventions. For a younger student, the template to pick the example that fits a read-aloud word works well. Students who learn word parts can extend Tier 2 knowledge on their own; see teaching root words and morphology. For more goal wording, see the vocabulary goals page.

Frequently asked questions

What is an example of a Tier 2 word?

Words like reluctant, compare, consequence, fortunate and analyze. They appear in many subjects and in books more often than in everyday talk, and they give students a more precise way to express ideas they already understand.

Should I ever teach Tier 1 words?

Yes, for students who do not know them. English learners and students with language disorders may need some everyday words taught directly. Check by asking the student to explain or use the word.

Are Tier 3 words less important?

No. Tier 3 words are needed to learn the subject. They are usually taught as part of the content lesson when the unit needs them, while Tier 2 words get extra practice because they come up everywhere.

Use it in IEP Atlas

Sources

Improving Adolescent Literacy: Effective Classroom and Intervention Practices, What Works Clearinghouse, Institute of Education Sciences
Report of the National Reading Panel: Teaching Children to Read, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)

Written and checked by the IEP Atlas editorial team under our editorial policy. This guide describes general practice and federal rules. It is not legal advice; your state may add requirements, and the IEP team makes the decisions for each student.