storm center vs flutter

storm center and flutter both are nouns.

Word	Noun	Adjective	Verb	Adverb
storm center	Yes	No	No	No
flutter	Yes	No	Yes	No

As nouns, flutter is a hypernym of storm center; that is, flutter is a word with a broader meaning than storm center:

Other hypernyms of storm center include commotion, disruption, disturbance, hoo-ha, hoo-hah, hurly burly, kerfuffle, to-do.

storm center (noun)	flutter (noun)
the central area or place of lowest barometric pressure within a storm	the act of moving back and forth
a center of trouble or disturbance	the motion made by flapping up and down
	abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
	a disorderly outburst or tumult

storm center (verb)	flutter (verb)
	wink briefly
	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