help out vs assist

help out is not a noun while assist is a noun.

Word	Noun	Adjective	Verb	Adverb
help out	No	No	Yes	No
assist	Yes	No	Yes	No

As verbs, assist is a hypernym of help out; that is, assist is a word with a broader meaning than help out:

Other hypernyms of help out include aid, help.

help out (noun)	assist (noun)
	(sports) the act of enabling another player to make a good play
	the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose

help out (verb)	assist (verb)
be of help, as in a particular situation of need	act as an assistant in a subordinate or supportive function
	work for, or be a servant to
	give help or assistance; be of service