Isabel Beck's three-tier vocabulary framework, commonly referenced on the MTEL Foundations of Reading, categorizes Tier 2 words as:
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A
Basic, everyday words that most young children already know (e.g., 'house,' 'run')
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B
High-frequency, sophisticated words that appear across many content areas and texts (e.g., 'fortunate,' 'analyze')
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C
Highly technical, domain-specific words used primarily in one subject area (e.g., 'metamorphosis,' 'legislature')
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D
Sight words that appear in more than 50% of printed text