gaff topsail vs fore-and-aft topsail

gaff topsail and fore-and-aft topsail both are nouns.

Word	Noun	Adjective	Verb	Adverb
gaff topsail	Yes	No	No	No
fore-and-aft topsail	Yes	No	No	No

As nouns, gaff topsail and fore-and-aft topsail are synonyms defined as:

gaff topsail and fore-and-aft topsail: a triangular fore-and-aft sail with its foot along the gaff and its luff on the topmast

gaff topsail (noun)	fore-and-aft topsail (noun)
a triangular fore-and-aft sail with its foot along the gaff and its luff on the topmast	a triangular fore-and-aft sail with its foot along the gaff and its luff on the topmast