jersey vs turtleneck

jersey and turtleneck both are nouns.

Word	Noun	Adjective	Verb	Adverb
jersey	Yes	No	No	No
turtleneck	Yes	No	No	No

As nouns, turtleneck is a hyponym of jersey; that is, turtleneck is a word with a more specific, narrower meaning than jersey:

Other hyponyms of jersey include polo-neck, turtle.

jersey (noun)	turtleneck (noun)
a slightly elastic machine-knit fabric	a sweater or jersey with a high close-fitting collar
a close-fitting pullover shirt