The conversation between human and AI assistant.
[|Human|] Classify the following words as either nouns or verbs: Work, Run, Book.
[|AI|] - Work: can be both a noun and a verb
- Run: can be both a noun and a verb
- Book: can be both a noun and a verb
[|Human|] 
Classify the following words as either nouns or verbs: Work, Run, Book.