"Secondhand" is usually an adjective: He bought a secondhand car where secondhand describes the car as used or previously owned.
"Secondhand" can also be used as an adverb: He bought the car secondhand where secondhand describes the manner in which he made the purchase.
"Second-hand" is either an adjective or a noun. As an adjective it means "previously used" and as a noun it means one of the hands on some clocks and watches.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
adverb
what part of speech is work
The part of speech for "unfamiliar" is an adjective.
The part of speech for "explicit" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "breezy" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "twirl" is a verb.