beta-carotene vs carotin

beta-carotene and carotin both are nouns.

Word	Noun	Adjective	Verb	Adverb
beta-carotene	Yes	No	No	No
carotin	Yes	No	No	No

As nouns, carotin is a hypernym of beta-carotene; that is, carotin is a word with a broader meaning than beta-carotene:

beta-carotene: an isomer of carotene that is found in dark green and dark yellow fruits and vegetables
carotin: an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver

Other hypernyms of beta-carotene include carotenoid, carotene, provitamin A.

beta-carotene (noun)	carotin (noun)
an isomer of carotene that is found in dark green and dark yellow fruits and vegetables	an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver