gold plate vs gold-plate

gold plate is a noun but gold-plate is not a noun.

Word	Noun	Adjective	Verb	Adverb
gold plate	Yes	No	Yes	No
gold-plate	No	No	Yes	No

As verbs, gold plate and gold-plate are synonyms defined as:

Other synonyms of gold plate include goldplate.

gold plate (noun)	gold-plate (noun)
a thin plating of gold on something
tableware that is plated with gold

gold plate (verb)	gold-plate (verb)
plate with gold	plate with gold