As nouns the difference between indogen and indigen
is that indogen is a complex nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo while indigen is an indigene or native.
indogen
English
Noun
(
en noun)
(organic compound) A complex nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo.
(
Webster 1913)
indigen
English
Noun
(
en noun)
An indigene or native.
A plant known to be indigenous to a region, rather than a cultigen.