flap vs undulate

undulate vs flap

flap is a noun but undulate is not a noun.

flap is not an adjective while undulate is an adjective.

flap and undulate both are verbs.

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

As verbs, flap and undulate are synonyms defined as:

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

Other synonyms of flap include roll, wave.

flap (noun)	undulate (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

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

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

Difference between flap and undulate

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