rejoin vs retort

rejoin is not a noun while retort is a noun.

Word	Noun	Adjective	Verb	Adverb
rejoin	No	No	Yes	No
retort	Yes	No	Yes	No

As verbs, rejoin and retort are synonyms defined as:

Other synonyms of rejoin include come back, repay, return, riposte.

rejoin (noun)	retort (noun)
	a vessel where substances are distilled or decomposed by heat
	a quick reply to a question or remark (especially a witty or critical one)

rejoin (verb)	retort (verb)
answer back	answer back
join again