priming vs primer coat

priming and primer coat both are nouns.

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

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

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

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

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