The conversation between human and AI assistant.
[|Human|] Identify the word in the following sentence that does not belong to the same word class as the rest:
[|AI|] The word "without" does not belong to the same word class as the others. It is a preposition, while the other words are either nouns, verbs or adverbs.
[|Human|] 
Identify the word in the following sentence that does not belong to the same word class as the rest: