As verbs the difference between wande and wane
is that
wande is while
wane is (
label) to progressively lose its splendor, value, ardor, power, intensity etc; to decline.
As a noun wane is
a gradual diminution in power, value, intensity etc or
wane can be (scotland|slang) a child or
wane can be (chiefly|northern england|and|scotland|obsolete) a house or dwelling.