tyrothricin vs tyrocidin

tyrothricin and tyrocidin both are nouns.

Word	Noun	Adjective	Verb	Adverb
tyrothricin	Yes	No	No	No
tyrocidin	Yes	No	No	No

tyrothricin (noun)	tyrocidin (noun)
a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria	a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin