deltoid vs deltoid muscle

deltoid and deltoid muscle both are nouns.

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

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

deltoid and deltoid muscle: a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm

Other synonyms of deltoid include musculus deltoideus.

deltoid (noun)	deltoid muscle (noun)
a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm	a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm

deltoid (adjective)	deltoid muscle (adjective)
triangular or suggesting a capital delta, with a point at the apex