primer coat vs priming coat

primer coat and priming coat both are nouns.

Word	Noun	Adjective	Verb	Adverb
primer coat	Yes	No	No	No
priming coat	Yes	No	No	No

As nouns, primer coat and priming coat are synonyms defined as:

primer coat and priming coat: the first or preliminary coat of paint or size applied to a surface

Other synonyms of primer coat include flat coat, ground, primer, priming, undercoat.

primer coat (noun)	priming coat (noun)
the first or preliminary coat of paint or size applied to a surface	the first or preliminary coat of paint or size applied to a surface