As adverbs the difference between hereunto and whereunto
is that hereunto
is (archaic) unto this; up to this time; hereto while whereunto
is unto what; to what purpose.
As a conjunction whereunto is
Other Comparisons: What's the difference?
(archaic) Unto this; up to this time; hereto.
unto what; to what purpose
* 1874 , , (w), XVIII
- I will retire as soon as you have told
(archaic or formal) unto which
- Whereunto leadeth this lost thread of gold.