stercobilinogen vs chromogen

stercobilinogen and chromogen both are nouns.

Word	Noun	Adjective	Verb	Adverb
stercobilinogen	Yes	No	No	No
chromogen	Yes	No	No	No

As nouns, chromogen is a hypernym of stercobilinogen; that is, chromogen is a word with a broader meaning than stercobilinogen:

stercobilinogen: a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine
chromogen: a compound that can be converted to a pigment

stercobilinogen (noun)	chromogen (noun)
a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine	a compound that can be converted to a pigment