urobilinogen vs chromogen

urobilinogen and chromogen both are nouns.

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

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

urobilinogen: 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

urobilinogen (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