kauri gum vs kauri copal

kauri gum and kauri copal both are nouns.

Word	Noun	Adjective	Verb	Adverb
kauri gum	Yes	No	No	No
kauri copal	Yes	No	No	No

As nouns, kauri gum and kauri copal are synonyms defined as:

kauri gum and kauri copal: resin of the kauri trees of New Zealand; found usually as a fossil; also collected for making varnishes and linoleum

Other synonyms of kauri gum include kauri, kauri resin.

kauri gum (noun)	kauri copal (noun)
resin of the kauri trees of New Zealand; found usually as a fossil; also collected for making varnishes and linoleum	resin of the kauri trees of New Zealand; found usually as a fossil; also collected for making varnishes and linoleum