talc vs rensselaerite

talc and rensselaerite both are nouns.

Word	Noun	Adjective	Verb	Adverb
talc	Yes	No	Yes	No
rensselaerite	Yes	No	No	No

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

talc: a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder
rensselaerite: a kind of soft talc; sometimes used as wood filler

Other hyponyms of talc include soap-rock, soaprock, soapstone, steatite, French chalk.

talc (noun)	rensselaerite (noun)
a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder	a kind of soft talc; sometimes used as wood filler

talc (verb)	rensselaerite (verb)
apply talcum powder to (one's body)