Trade can be a noun or a verb.
It means some body give you something that you trade them back something. For example a lollies
Carpentry is a noun--a person, place, thing, or idea. In this case it is a thing, a trade, skill, or art.
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.