latex vs India rubber

latex and India rubber both are nouns.

Word	Noun	Adjective	Verb	Adverb
latex	Yes	No	No	No
India rubber	Yes	No	No	No

As nouns, India rubber is a hyponym of latex; that is, India rubber is a word with a more specific, narrower meaning than latex:

latex: a milky exudate from certain plants that coagulates on exposure to air
India rubber: an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products

Other hyponyms of latex include caoutchouc, gum elastic, natural rubber, rubber.

latex (noun)	India rubber (noun)
a water-base paint that has a latex binder	an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products
a milky exudate from certain plants that coagulates on exposure to air