latex vs caoutchouc

latex and caoutchouc both are nouns.

Word	Noun	Adjective	Verb	Adverb
latex	Yes	No	No	No
caoutchouc	Yes	No	No	No

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

latex: a milky exudate from certain plants that coagulates on exposure to air
caoutchouc: 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 gum elastic, India rubber, natural rubber, rubber.

latex (noun)	caoutchouc (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