carotenoid vs lutein

carotenoid and lutein both are nouns.

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

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

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

Other hyponyms of carotenoid include carotene, lycopene, beta-carotene, xanthophyl, xanthophyll, zeaxanthin.

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