Which group of words typically encompasses those that students must use less frequently but are critical for content areas?

Tier III words are specialized vocabulary that is often specific to particular content areas or subjects. These words may include terms that are essential for understanding concepts in subjects such as mathematics, science, social studies, or technical fields. For example, terms like "photosynthesis," "inertia," or "ecosystem" are all Tier III words that are critical for students to grasp in their respective subject areas.

In contrast, Tier I words are basic vocabulary used in everyday conversation and typically do not require explicit teaching. Common vocabulary encompasses words that are frequently used across various contexts. Conversational words are those that students might use more often in day-to-day communication but are not necessarily tied to academic or specialized content. Thus, Tier III words stand out as the category that students will encounter less frequently but are essential for mastering the specific knowledge and skills needed in academic disciplines.