undulation vs flap

flap vs undulation

undulation and flap both are nouns.

undulation is not a verb while flap is a verb.

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

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

undulation: (physics) a movement up and down or back and forth
flap: the motion made by flapping up and down

Other hyponyms of undulation include gravitation wave, gravity wave, sine wave, oscillation, vibration, fluctuation, seiche, standing wave, stationary wave, traveling wave, travelling wave, acoustic wave, sound wave, wave form, wave shape, waveform, blast wave, shock wave, impulse, pulsation, pulse, pulsing, flapping, flutter, fluttering.

undulation (noun)	flap (noun)
(physics) a movement up and down or back and forth	any broad thin and limber covering attached at one edge; hangs loose or projects freely
wavelike motion; a gentle rising and falling in the manner of waves	a movable airfoil that is part of an aircraft wing; used to increase lift or drag
an undulating curve	a movable piece of tissue partly connected to the body
	the motion made by flapping up and down
	an excited state of agitation

undulation (verb)	flap (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 undulation and flap

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