crush out vs stub

crush out is not a noun while stub is a noun.

Word	Noun	Adjective	Verb	Adverb
crush out	No	No	Yes	No
stub	Yes	No	Yes	No

As verbs, crush out and stub are synonyms defined as:

Other synonyms of crush out include extinguish, press out, stub out.

crush out (noun)	stub (noun)
	the small unused part of something (especially the end of a cigarette that is left after smoking)
	a torn part of a ticket returned to the holder as a receipt
	the part of a check that is retained as a record
	a short piece remaining on a trunk or stem where a branch is lost
	a small piece

crush out (verb)	stub (verb)
extinguish by crushing	strike (one's toe) accidentally against an object
	clear of weeds by uprooting them
	extinguish by crushing
	pull up (weeds) by their roots