sailing vs luff

sailing and luff both are nouns.

Word	Noun	Adjective	Verb	Adverb
sailing	Yes	No	No	No
luff	Yes	No	Yes	No

As nouns, luff is a hyponym of sailing; that is, luff is a word with a more specific, narrower meaning than sailing:

Other hyponyms of sailing include beat, tack.

sailing (noun)	luff (noun)
riding in a sailboat	the act of sailing close to the wind
the work of a sailor	(nautical) the forward edge of a fore-and-aft sail that is next to the mast
the departure of a vessel from a port
the activity of flying a glider

sailing (verb)	luff (verb)
	flap when the wind is blowing equally on both sides
	sail close to the wind