gluteus vs skeletal muscle

gluteus and skeletal muscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
gluteus	Yes	No	No	No
skeletal muscle	Yes	No	No	No

As nouns, skeletal muscle is a hypernym of gluteus; that is, skeletal muscle is a word with a broader meaning than gluteus:

gluteus: any one of three large skeletal muscles that form the buttock and move the thigh
skeletal muscle: a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes

Other hypernyms of gluteus include striated muscle.

gluteus (noun)	skeletal muscle (noun)
any one of three large skeletal muscles that form the buttock and move the thigh	a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes