flutter vs flit

flutter and flit both are nouns.

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

As verbs, flutter and flit are synonyms defined as:

Other synonyms of flutter include dart, fleet.

flutter (noun)	flit (noun)
the act of moving back and forth	a sudden quick movement
the motion made by flapping up and down	a secret move (to avoid paying debts)
abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
a disorderly outburst or tumult

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