quadriceps femoris vs quad

quadriceps femoris and quad both are nouns.

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

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

Other synonyms of quadriceps femoris include musculus quadriceps femoris, quadriceps.

quadriceps femoris (noun)	quad (noun)
a muscle of the thigh that extends the leg	a rectangular area surrounded on all sides by buildings
	(printing) a block of type without a raised letter; used for spacing between words or sentences
	a muscle of the thigh that extends the leg
	one of four children born at the same time from the same pregnancy