gaffsail vs fore-and-aft sail

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

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

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

gaffsail: a quadrilateral fore-and-aft sail suspended from a gaff
fore-and-aft sail: any sail not set on a yard and whose normal position is in a fore-and-aft direction

gaffsail (noun)	fore-and-aft sail (noun)
a quadrilateral fore-and-aft sail suspended from a gaff	any sail not set on a yard and whose normal position is in a fore-and-aft direction