refresh vs refresher

refresh is not a noun while refresher is a noun.

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

refresh (noun)	refresher (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

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