"flutter" in the noun sense
1. waver, flutter, flicker
the act of moving back and forth
abnormally rapid beating of the auricles of the heart (especially in a regular rhythm can result in heart block
3. disturbance, disruption, commotion, flutter, hurly burly, to-do, hoo-ha, hoo-hah, kerfuffle
a disorderly outburst or tumult
"they were amazed by the furious disturbance they had caused"
4. flap, flapping, flutter, fluttering
the motion made by flapping up and down
"flutter" in the verb sense
1. flit, flutter, fleet, dart
move along rapidly and lightly skim or dart
"The hummingbird flitted among the branches"
2. flicker, waver, flitter, flutter, quiver
move back and forth very rapidly
"the candle flickered"
flap the wings rapidly or fly with flapping movements
"The seagulls fluttered overhead"
4. palpitate, flutter
"His heart palpitated"
5. bat, flutter
"bat one's eyelids"
Source: WordNet® (An amazing lexical database of English)
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