rotator cuff vs musculus deltoideus

rotator cuff and musculus deltoideus both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotator cuff	Yes	No	No	No
musculus deltoideus	Yes	No	No	No

rotator cuff (noun)	musculus deltoideus (noun)
a supporting structure of the shoulder consisting of the muscles and tendons that attach the arm to the shoulder joint and enable the arm to move	a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm