primer coat vs priming

primer coat and priming both are nouns.

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

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

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

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

primer coat (noun)	priming (noun)
the first or preliminary coat of paint or size applied to a surface	the act of making something ready
	any igniter that is used to initiate the burning of a propellant
	the first or preliminary coat of paint or size applied to a surface