bitumen vs kerite

bitumen and kerite both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitumen	Yes	No	No	No
kerite	Yes	No	No	No

As nouns, kerite is a hyponym of bitumen; that is, kerite is a word with a more specific, narrower meaning than bitumen:

bitumen: any of various naturally occurring impure mixtures of hydrocarbons
kerite: a compound in which tar or asphalt combined with animal or vegetable oils is vulcanized by sulphur, the product closely resembling rubber.

Other hyponyms of bitumen include pitch, tar.

bitumen (noun)	kerite (noun)
any of various naturally occurring impure mixtures of hydrocarbons	a compound in which tar or asphalt combined with animal or vegetable oils is vulcanized by sulphur, the product closely resembling rubber.