shellac vs shellac varnish

shellac and shellac varnish both are nouns.

Word	Noun	Adjective	Verb	Adverb
shellac	Yes	No	Yes	No
shellac varnish	Yes	No	No	No

As nouns, shellac and shellac varnish are synonyms defined as:

shellac and shellac varnish: a thin varnish made by dissolving lac in ethanol; used to finish wood

shellac (noun)	shellac varnish (noun)
a thin varnish made by dissolving lac in ethanol; used to finish wood	a thin varnish made by dissolving lac in ethanol; used to finish wood
lac purified by heating and filtering; usually in thin orange or yellow flakes but sometimes bleached white

shellac (verb)	shellac varnish (verb)
cover with shellac