yellow bile vs body fluid

yellow bile and body fluid both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow bile	Yes	No	No	No
body fluid	Yes	No	No	No

As nouns, body fluid is a hypernym of yellow bile; that is, body fluid is a word with a broader meaning than yellow bile:

yellow bile: a humor that was once believed to be secreted by the liver and to cause irritability and anger
body fluid: the liquid parts of the body

Other hypernyms of yellow bile include bodily fluid, humor, humour, liquid body substance.

yellow bile (noun)	body fluid (noun)
a humor that was once believed to be secreted by the liver and to cause irritability and anger	the liquid parts of the body