biceps humeri vs musculus biceps brachii

biceps humeri and musculus biceps brachii both are nouns.

Word	Noun	Adjective	Verb	Adverb
biceps humeri	Yes	No	No	No
musculus biceps brachii	Yes	No	No	No

As nouns, biceps humeri and musculus biceps brachii are synonyms defined as:

biceps humeri and musculus biceps brachii: a muscle that flexes and supinates the forearm

Other synonyms of biceps humeri include biceps brachii.

biceps humeri (noun)	musculus biceps brachii (noun)
a muscle that flexes and supinates the forearm	a muscle that flexes and supinates the forearm