spanker vs fore-and-aft sail

spanker and fore-and-aft sail both are nouns.

Word	Noun	Adjective	Verb	Adverb
spanker	Yes	No	No	No
fore-and-aft sail	Yes	No	No	No

As nouns, fore-and-aft sail is a hypernym of spanker; that is, fore-and-aft sail is a word with a broader meaning than spanker:

spanker: a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel
fore-and-aft sail: any sail not set on a yard and whose normal position is in a fore-and-aft direction

spanker (noun)	fore-and-aft sail (noun)
a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel	any sail not set on a yard and whose normal position is in a fore-and-aft direction
a hitter who slaps (usually another person) with an open hand