plant structure vs stub

plant structure and stub both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant structure	Yes	No	No	No
stub	Yes	No	Yes	No

As nouns, stub is a hyponym of plant structure; that is, stub is a word with a more specific, narrower meaning than plant structure:

plant structure (noun)	stub (noun)
any part of a plant or fungus	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

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