buttressing vs buttress

buttressing and buttress both are nouns.

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

As nouns, buttressing and buttress are synonyms defined as:

buttressing and buttress: a support usually of stone or brick; supports the wall of a building

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

buttressing (verb)	buttress (verb)
	make stronger or defensible
	reinforce with a buttress