refresher vs refresh

refresher is a noun but refresh is not a noun.

Word	Noun	Adjective	Verb	Adverb
refresher	Yes	No	No	No
refresh	No	No	Yes	No

refresher (noun)	refresh (noun)
a course that reviews and updates a topic for those who have not kept abreast of developments
a drink that refreshes
a fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one day

refresher (verb)	refresh (verb)
	make fresh again
	become or make oneself fresh again
	make (to feel) fresh
	refresh one's memory