serratus posterior vs posterior serratus muscle

serratus posterior and posterior serratus muscle both are nouns.

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

As nouns, serratus posterior and posterior serratus muscle are synonyms defined as:

serratus posterior and posterior serratus muscle: skeletal muscle that draws the rib cage backward and downward

Other synonyms of serratus posterior include musculus serratus posterior.

serratus posterior (noun)	posterior serratus muscle (noun)
skeletal muscle that draws the rib cage backward and downward	skeletal muscle that draws the rib cage backward and downward