rennin vs chymosin

rennin and chymosin both are nouns.

Word	Noun	Adjective	Verb	Adverb
rennin	Yes	No	No	No
chymosin	Yes	No	No	No

As nouns, rennin and chymosin are synonyms defined as:

rennin and chymosin: an enzyme that occurs in gastric juice; causes milk to coagulate

rennin (noun)	chymosin (noun)
an enzyme that occurs in gastric juice; causes milk to coagulate	an enzyme that occurs in gastric juice; causes milk to coagulate