flap vs cusp

flap and cusp both are nouns.

flap is a verb but cusp is not a verb.

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

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

flap: a movable piece of tissue partly connected to the body
cusp: a thin triangular flap of a heart valve

Other hyponyms of flap include uvula, soft palate, velum, protective fold, leaflet.

flap (noun)	cusp (noun)
any broad thin and limber covering attached at one edge; hangs loose or projects freely	point formed by two intersecting arcs (as from the intrados of a Gothic arch)
a movable airfoil that is part of an aircraft wing; used to increase lift or drag	small elevation on the grinding surface of a tooth
a movable piece of tissue partly connected to the body	a thin triangular flap of a heart valve
the motion made by flapping up and down
an excited state of agitation

flap (verb)	cusp (verb)
pronounce with a flap, of alveolar sounds
make a fuss; be agitated
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 cusp

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