xanthophyl vs carotenoid

xanthophyl and carotenoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
xanthophyl	Yes	No	No	No
carotenoid	Yes	No	No	No

As nouns, carotenoid is a hypernym of xanthophyl; that is, carotenoid is a word with a broader meaning than xanthophyl:

xanthophyl: yellow carotenoid pigments in plants and animal fats and egg yolks
carotenoid: any of a class of highly unsaturated yellow to red pigments occurring in plants and animals

xanthophyl (noun)	carotenoid (noun)
yellow carotenoid pigments in plants and animal fats and egg yolks	any of a class of highly unsaturated yellow to red pigments occurring in plants and animals