What term refers to words that are commonly heard in various contexts and require little explicit instruction?

The term that refers to words commonly heard in various contexts and that require little explicit instruction is Tier One Vocabulary. This category of vocabulary encompasses basic, everyday words that children typically acquire through direct experience and social interaction, such as "baby," "happy," or "house." These words are foundational to language development and are often the first words that children learn and use in their speech.

In contrast, Tier Two Vocabulary consists of more advanced words that are often encountered in written texts and that require more explicit instruction to understand, such as "analyze," "compare," or "contrast." Tier Three Vocabulary includes specialized terms that are specific to certain fields or subjects, like "photosynthesis" in science or "optimization" in mathematics, and these are also less commonly used in daily language. Technical Vocabulary is similar to Tier Three, focusing on terms that are used in particular disciplines or professions. Therefore, Tier One Vocabulary is the most suited to describe everyday words that do not require extensive teaching.