Nouns: person, place, thing (e.g., "act" → "action").
Verbs: actions or states (e.g., "act" → "react").
Adjectives: describe nouns (e.g., "act" → "active").
Adverbs: describe verbs, adjectives, or other adverbs (e.g., "active" → "actively").
Focus: Be aware of whether the word needs to be singular, plural, positive, or negative.