It is an adverb. That is, it modifies and/or describes the verb in the sentence. For example: 'Perhaps he will go to the store' is a modification of the verb 'go' in 'He will go to the store.' In another situation a dialogue could be posed: "Will you go to the store?" Answer: 'Perhaps.' The use of perhaps here as a stand alone response implies a modification of the verb in the question, meaning 'perhaps I will go to the store.' It would have been more obviously stated as an adverb had the response been 'Yes, shortly', or any other word that ends in '-ly', the usual ending for adverbs.
Perhaps is an adverb :)
adverb
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No, "perhaps" is an adverb used to indicate uncertainty or possibility in a sentence. It does not function as a preposition, which is a part of speech that typically shows the relationship between a noun/pronoun and other words in a sentence.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
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adverb
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech of "came" is a verb.
The part of speech for "buried" is a verb.
The part of speech for "rapid" is an adjective.