"Bike" (short for bicycle) can be a noun or a verb:
Andrew often rides his bike during his lunch break.
If the weather is nice, Sam likes to bike to work.
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
what part of speech is eleven
Verb.
Bike rider, randonneur.
verb - as in "ride the bike" noun - as in "go for a ride"
The part of speech for "answer" is a noun.
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part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The part of speech for "indefinite" is an adjective.