rhomboid vs rhomboid muscle

rhomboid and rhomboid muscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhomboid	Yes	Yes	No	No
rhomboid muscle	Yes	No	No	No

As nouns, rhomboid and rhomboid muscle are synonyms defined as:

rhomboid and rhomboid muscle: any of several muscles of the upper back that help move the shoulder blade

rhomboid (noun)	rhomboid muscle (noun)
any of several muscles of the upper back that help move the shoulder blade	any of several muscles of the upper back that help move the shoulder blade
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal

rhomboid (adjective)	rhomboid muscle (adjective)
shaped like a rhombus or rhomboid