haemitin vs heme

haemitin and heme both are nouns.

Word	Noun	Adjective	Verb	Adverb
haemitin	Yes	No	No	No
heme	Yes	No	No	No

As nouns, haemitin and heme are synonyms defined as:

haemitin and heme: a complex red organic pigment containing iron and other atoms to which oxygen binds

Other synonyms of haemitin include haem, hematin, protoheme.

haemitin (noun)	heme (noun)
a complex red organic pigment containing iron and other atoms to which oxygen binds	a complex red organic pigment containing iron and other atoms to which oxygen binds