It can be a verb, a noun, or, informally, an adjective.
You can bargain with someone, (verb), you can be given a bargain on a purchase (noun), or you can purchase a bargain item (adjective).
The use of "bargain" as an adjective is not considered technically correct, but it is still occasionally used in informal contexts.
adverb
what part of speech is beneath
i want to know what part of speech is camping
The part of speech is a adjective
Oppose is a verb.
The Wagner Act
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.
The part of speech for "indefinite" is an adjective.