rotator cuff vs deltoid

rotator cuff and deltoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotator cuff	Yes	No	No	No
deltoid	Yes	Yes	No	No

rotator cuff (noun)	deltoid (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

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