cumarone vs coumarone

cumarone and coumarone both are nouns.

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

As nouns, cumarone and coumarone are synonyms defined as:

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

Other synonyms of cumarone include benzofuran.

cumarone (noun)	coumarone (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