building vs quoin

building and quoin both are nouns.

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

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