kauri copal vs kauri gum

kauri copal and kauri gum both are nouns.

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

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

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

Other synonyms of kauri copal include kauri, kauri resin.

kauri copal (noun)	kauri gum (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