topsail vs fore-topsail

topsail and fore-topsail both are nouns.

Word	Noun	Adjective	Verb	Adverb
topsail	Yes	No	No	No
fore-topsail	Yes	No	No	No

As nouns, fore-topsail is a hyponym of topsail; that is, fore-topsail is a word with a more specific, narrower meaning than topsail:

topsail: a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast
fore-topsail: the topsail on a foremast

topsail (noun)	fore-topsail (noun)
a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast	the topsail on a foremast