undulate vs flap

flap vs undulate

undulate is not a noun while flap is a noun.

undulate is an adjective but flap is not an adjective.

undulate and flap both are verbs.

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

As verbs, undulate and flap are synonyms defined as:

undulate and flap: move in a wavy pattern or with a rising and falling motion

Other synonyms of undulate include roll, wave.

undulate (noun)	flap (noun)
	any broad thin and limber covering attached at one edge; hangs loose or projects freely
	a movable airfoil that is part of an aircraft wing; used to increase lift or drag
	a movable piece of tissue partly connected to the body
	the motion made by flapping up and down
	an excited state of agitation

undulate (adjective)	flap (adjective)
having a wavy margin and rippled surface

undulate (verb)	flap (verb)
increase and decrease in volume or pitch, as if in waves	pronounce with a flap, of alveolar sounds
move in a wavy pattern or with a rising and falling motion	make a fuss; be agitated
stir up (water) so as to form ripples	to flutter noisily when moved by the wind
occur in soft rounded shapes	move in a wavy pattern or with a rising and falling motion
	move with a flapping motion
	move with a thrashing motion

Difference between undulate and flap

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