flap vs undulation

undulation vs flap

flap and undulation both are nouns.

flap is a verb but undulation is not a verb.

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

As nouns, undulation is a hypernym of flap; that is, undulation is a word with a broader meaning than flap:

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

Other hypernyms of flap include wave.

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

flap (verb)	undulation (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 undulation

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