musculus deltoideus vs deltoid muscle

musculus deltoideus and deltoid muscle both are nouns.

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

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

musculus deltoideus 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 musculus deltoideus include deltoid.

musculus deltoideus (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