turtleneck vs tee shirt

turtleneck and tee shirt both are nouns.

Word	Noun	Adjective	Verb	Adverb
turtleneck	Yes	No	No	No
tee shirt	Yes	No	No	No

As nouns, tee shirt is a hypernym of turtleneck; that is, tee shirt is a word with a broader meaning than turtleneck:

Other hypernyms of turtleneck include jersey, T-shirt, jumper, sweater.

turtleneck (noun)	tee shirt (noun)
a sweater or jersey with a high close-fitting collar	a close-fitting pullover shirt