shirtsleeve vs sleeve

shirtsleeve and sleeve both are nouns.

Word	Noun	Adjective	Verb	Adverb
shirtsleeve	Yes	No	No	No
sleeve	Yes	No	No	No

As nouns, sleeve is a hypernym of shirtsleeve; that is, sleeve is a word with a broader meaning than shirtsleeve:

shirtsleeve: the sleeve of a shirt
sleeve: the part of a garment that is attached at the armhole and that provides a cloth covering for the arm

Other hypernyms of shirtsleeve include arm.

shirtsleeve (noun)	sleeve (noun)
the sleeve of a shirt	the part of a garment that is attached at the armhole and that provides a cloth covering for the arm
	small case into which an object fits