chlorophyll b vs chlorophyl

chlorophyll b and chlorophyl both are nouns.

Word	Noun	Adjective	Verb	Adverb
chlorophyll b	Yes	No	No	No
chlorophyl	Yes	No	No	No

As nouns, chlorophyl is a hypernym of chlorophyll b; that is, chlorophyl is a word with a broader meaning than chlorophyll b:

chlorophyll b: a dark-green plant pigment having a brilliant green alcohol solution; generally characteristic of higher plants
chlorophyl: any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms

Other hypernyms of chlorophyll b include chlorophyll.

chlorophyll b (noun)	chlorophyl (noun)
a dark-green plant pigment having a brilliant green alcohol solution; generally characteristic of higher plants	any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms