Off can be used as an adverb, preposition, adjective, or verb.
part of speech
Adjective
What part of speech is thaw
The word 'door' is a noun, a word for a movable structure used to close off an entrance or a part of a piece of furniture; a word for a thing.
The part of speech for oscillate is verb.
it is ADVERB.
preposition
phrasal verb
yes
When a person refers to something that has died-off or dies-off, they commonly use it as a verb
Adjective, because off is describing the tv, a noun (thing), and comes after is, a verb (action).
A verb, as in "Copying answers blindly off the Internet may disqualify you."
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