quoin vs building

quoin and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
quoin	Yes	No	No	No
building	Yes	No	No	No

quoin (noun)	building (noun)
(architecture) solid exterior angle of a building; especially one formed by a cornerstone	the act of constructing something
the keystone of an arch	the commercial activity involved in repairing old structures or constructing new ones
expandable metal or wooden wedge used by printers to lock up a form within a chase	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building