flicker vs flutter

flicker and flutter both are nouns.

Word	Noun	Adjective	Verb	Adverb
flicker	Yes	No	Yes	No
flutter	Yes	No	Yes	No

As nouns, flicker and flutter are synonyms defined as:

Other synonyms of flicker include waver.

As verbs, flicker and flutter are synonyms defined as:

Other synonyms of flicker include flitter, quiver, waver.

flicker (noun)	flutter (noun)
the act of moving back and forth	the act of moving back and forth
North American woodpecker	the motion made by flapping up and down
a momentary flash of light	abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
	a disorderly outburst or tumult

flicker (verb)	flutter (verb)
move back and forth very rapidly	wink briefly
flash intermittently	beat rapidly
shine unsteadily	move back and forth very rapidly
	move along rapidly and lightly; skim or dart
	flap the wings rapidly or fly with flapping movements