unite vs get together

unite is not a noun while get together is a noun.

Word	Noun	Adjective	Verb	Adverb
unite	No	No	Yes	No
get together	Yes	No	Yes	No

As verbs, get together is a hypernym of unite; that is, get together is a word with a broader meaning than unite:

Other hypernyms of unite include fall in, join.

unite (noun)	get together (noun)
	a small informal social gathering

unite (verb)	get together (verb)
become one	get together socially or for a specific purpose
join or combine	become part of; become a member of a group or organization
act in concert or unite in a common purpose or belief	get people together
bring together for a common purpose or action or ideology or in a shared situation
have or possess in combination
be or become joined or united or linked