A prepositional phrase.
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The word unless is a conjunction. It is used to mean except.
It can be a preposition and an adverb. Preposition: other than; except for Adverb: In addition; also
It can be a preposition: They work every day except Sunday. a conjunction: I didn't tell him anything, except that I needed the money. or a verb: He excepted from his criticism a handful of distinguished writers.
It is an adverb. Pretty much all words that end in "ly" are adverbs except for a few rare exceptions.
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.