In archaic|lang=en terms the difference between pair and vair
is that
pair is (archaic) a number of things resembling one another, or belonging together; a set while
vair is (archaic) a type of fur from a squirrel with a black back and white belly, much used on garments in the middle ages.
As nouns the difference between pair and vair
is that
pair is two similar or identical things taken together; often followed by of while
vair is (archaic) a type of fur from a squirrel with a black back and white belly, much used on garments in the middle ages.
As a verb pair
is to group into sets of two or
pair can be (obsolete) to impair.