"spanker" in the noun sense
1. slapper, spanker
a hitter who slaps (usually another person) with an open hand
"someone slapped me on the back and I turned to see who the slapper was"
"my father was the designated spanker in our family"
a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel
Source: WordNet® (An amazing lexical database of English)
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