luff vs sailing

luff and sailing both are nouns.

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

As nouns, sailing is a hypernym of luff; that is, sailing is a word with a broader meaning than luff:

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

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