As nouns the difference between gatch and tatch
is that gatch is a form of plaster of Paris formerly used in Persia while tatch is a spot or stain.
gatch
English
Noun
(-)
A form of plaster of Paris formerly used in Persia
tatch
English
Noun
(
es)
(obsolete) A spot or stain.
-
(obsolete) A trick.
(
Webster 1913)