stub out vs stub

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

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

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

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

stub 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

stub 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