priming coat vs primer coat

priming coat and primer coat both are nouns.

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

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

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

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

priming coat (noun)	primer 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