assist vs expedite

assist is a noun but expedite is not a noun.

Word	Noun	Adjective	Verb	Adverb
assist	Yes	No	Yes	No
expedite	No	No	Yes	No

As verbs, expedite is a hyponym of assist; that is, expedite is a word with a more specific, narrower meaning than assist:

assist (noun)	expedite (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

assist (verb)	expedite (verb)
act as an assistant in a subordinate or supportive function	speed up the progress of; facilitate
work for, or be a servant to	process fast and efficiently
give help or assistance; be of service