In archaic|lang=en terms the difference between ayre and fayre
is that
ayre is (archaic) air while
fayre is (archaic) fare.
As nouns the difference between ayre and fayre
is that
ayre is a narrow bar of sand or gravel formed by the sea; a sandbank or
ayre can be (archaic) air while
fayre is (archaic) fair
(in the sense of both (market) and (pretty)) .
As an adjective fayre is
(archaic) fair, beautiful.