Final answer:
Tier 2 words should be high-frequency words with multiple meanings; these words are beneficial for students to learn because they enhance vocabulary and cognitive skills across various contexts.
Step-by-step explanation:
The criteria for selecting Tier 2 vocabulary words focus on words that are high frequency for mature language users and are found across a variety of domains. When choosing Tier 2 words, you should focus on words with multiple meanings because they provide a lot of teaching power due to their utility in various contexts. Unlike words with rare spellings or limited applicability, words with multiple meanings can enrich students' language and cognitive abilities. Moreover, selecting such words helps students with critical thinking and understanding nuances in language.