quadriceps femoris vs musculus quadriceps femoris

quadriceps femoris and musculus quadriceps femoris both are nouns.

Word	Noun	Adjective	Verb	Adverb
quadriceps femoris	Yes	No	No	No
musculus quadriceps femoris	Yes	No	No	No

As nouns, quadriceps femoris and musculus quadriceps femoris are synonyms defined as:

quadriceps femoris and musculus quadriceps femoris: a muscle of the thigh that extends the leg

Other synonyms of quadriceps femoris include quad, quadriceps.

quadriceps femoris (noun)	musculus quadriceps femoris (noun)
a muscle of the thigh that extends the leg	a muscle of the thigh that extends the leg