In lang=en terms the difference between harmonize and pair
is that
harmonize is to provide the harmony for a (
l) while
pair is to suit; to fit, as a counterpart.
As verbs the difference between harmonize and pair
is that
harmonize is to be in (
l) (
l) while
pair is to group into sets of two or
pair can be (obsolete) to impair.
As a noun pair is
two similar or identical things taken together; often followed by of.