fortify vs buttress

fortify is not a noun while buttress is a noun.

Word	Noun	Adjective	Verb	Adverb
fortify	No	No	Yes	No
buttress	Yes	No	Yes	No

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

fortify (noun)	buttress (noun)
	a support usually of stone or brick; supports the wall of a building

fortify (verb)	buttress (verb)
add alcohol to (beverages)	make stronger or defensible
make strong or stronger	reinforce with a buttress
add nutrients to
prepare oneself for a military confrontation
enclose by or as if by a fortification