It can be different parts of speech.
In this instance the "up" is being used as an adverb related to the verb "climbed".
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.
In this instance the "up" is being used as an adverb related to the verb "climbed".
Rigging can be: a noun -- He climbed up the rigging to the top of the mast. a verb ( the present participle of rig ) -- He is rigging the competition so his son will win.
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.