spanker vs slapper

spanker and slapper both are nouns.

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

As nouns, spanker and slapper are synonyms defined as:

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

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