slapper vs spanker

slapper and spanker both are nouns.

Word	Noun	Adjective	Verb	Adverb
slapper	Yes	No	No	No
spanker	Yes	No	No	No

As nouns, slapper and spanker are synonyms defined as:

slapper and spanker: a hitter who slaps (usually another person) with an open hand

slapper (noun)	spanker (noun)
a hitter who slaps (usually another person) with an open hand	a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel
	a hitter who slaps (usually another person) with an open hand