flap vs luff

flap and luff both are nouns.

flap and luff both are verbs.

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

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

flap: move in a wavy pattern or with a rising and falling motion
luff: flap when the wind is blowing equally on both sides

flap (noun)	luff (noun)
any broad thin and limber covering attached at one edge; hangs loose or projects freely	the act of sailing close to the wind
a movable airfoil that is part of an aircraft wing; used to increase lift or drag	(nautical) the forward edge of a fore-and-aft sail that is next to the mast
a movable piece of tissue partly connected to the body
the motion made by flapping up and down
an excited state of agitation

flap (verb)	luff (verb)
pronounce with a flap, of alveolar sounds	flap when the wind is blowing equally on both sides
make a fuss; be agitated	sail close to the wind
to flutter noisily when moved by the wind
move in a wavy pattern or with a rising and falling motion
move with a flapping motion
move with a thrashing motion

Difference between flap and luff

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