coumarone vs cumarone

coumarone and cumarone both are nouns.

Word	Noun	Adjective	Verb	Adverb
coumarone	Yes	No	No	No
cumarone	Yes	No	No	No

As nouns, coumarone and cumarone are synonyms defined as:

coumarone and cumarone: a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins

Other synonyms of coumarone include benzofuran.

coumarone (noun)	cumarone (noun)
a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins	a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins