The conversation between human and AI assistant.
[|Human|] Categorize all the words from the sentence into either nouns, verbs, adjectives or adverbs.
[|AI|] Nouns: river, breeze, summer
Verbs: rippled
Adjectives: peaceful
Adverbs: gently
[|Human|] 
Categorize all the words from the sentence into either nouns, verbs, adjectives or adverbs.