lutein vs carotenoid

lutein and carotenoid both are nouns.

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

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

lutein: 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

lutein (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