serratus vs skeletal muscle

serratus and skeletal muscle both are nouns.

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

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

serratus: any of several muscles of the trunk
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 serratus include striated muscle.

serratus (noun)	skeletal muscle (noun)
any of several muscles of the trunk	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