quad vs quadriceps

quad and quadriceps both are nouns.

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

As nouns, quad and quadriceps are synonyms defined as:

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

quad (noun)	quadriceps (noun)
a rectangular area surrounded on all sides by buildings	a muscle of the thigh that extends the leg
(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