Which word listed is an example of a Tier 1 word?

A Tier 1 word is generally defined as a basic vocabulary term that is commonly used in everyday conversation and is typically familiar to all speakers of a language, regardless of their age or background. These words tend to be concrete and may not require explicit teaching because they are often learned through everyday interactions and experiences.

Pillow is an excellent example of a Tier 1 word because it refers to a common item that most people encounter regularly in their lives—specifically when they sleep. It is straightforward and does not have complex or abstract meanings associated with it, making it easily recognizable by children and adults alike.

In contrast, the other options represent vocabulary that may be slightly less common or more context-dependent. For instance, "brisk" could describe a manner of action or a weather condition, "adventure" implies a specific type of experience that might require additional context to fully understand, and "happy," while somewhat common, may still be less universally grasped than pillow in the context of everyday items. Thus, pillow clearly aligns with the characteristics of a Tier 1 word.