extinguish vs stub

extinguish is not a noun while stub is a noun.

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

As verbs, extinguish and stub are synonyms defined as:

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

As verbs, stub is a hyponym of extinguish; that is, stub is a word with a more specific, narrower meaning than extinguish:

Other hyponyms of extinguish include crush out, extinguish, press out, stub out, douse, put out.

extinguish (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

extinguish (verb)	stub (verb)
put an end to; kill	strike (one's toe) accidentally against an object
kill in large numbers	clear of weeds by uprooting them
terminate, end, or take out	extinguish by crushing
extinguish by crushing	pull up (weeds) by their roots
put out, as of fires, flames, or lights