liquid body substance vs body fluid

liquid body substance and body fluid both are nouns.

Word	Noun	Adjective	Verb	Adverb
liquid body substance	Yes	No	No	No
body fluid	Yes	No	No	No

As nouns, liquid body substance and body fluid are synonyms defined as:

Other synonyms of liquid body substance include bodily fluid, humor, humour.

liquid body substance (noun)	body fluid (noun)
the liquid parts of the body	the liquid parts of the body