Yestereve is a derived term of yester.
In archaic|lang=en terms the difference between yestereve and yester
is that
yestereve is (archaic) yesterday evening while
yester is (archaic) yesterday.
As nouns the difference between yestereve and yester
is that
yestereve is (archaic) yesterday evening while
yester is (archaic) yesterday.
As adverbs the difference between yestereve and yester
is that
yestereve is (during) yesterday evening while
yester is (archaic) yesterday.
As an adjective yester is
(archaic) last; last past; next before; of or pertaining to yesterday.