storm center vs to-do

storm center and to-do both are nouns.

Word	Noun	Adjective	Verb	Adverb
storm center	Yes	No	No	No
to-do	Yes	No	No	No

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

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

storm center (noun)	to-do (noun)
the central area or place of lowest barometric pressure within a storm	a disorderly outburst or tumult
a center of trouble or disturbance