disturbance vs to-do

disturbance and to-do both are nouns.

Word	Noun	Adjective	Verb	Adverb
disturbance	Yes	No	No	No
to-do	Yes	No	No	No

As nouns, disturbance and to-do are synonyms defined as:

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

disturbance (noun)	to-do (noun)
the act of disturbing something or someone; setting something in motion	a disorderly outburst or tumult
a noisy fight
activity that is a malfunction, intrusion, or interruption
electrical or acoustic activity that can disturb communication
a disorderly outburst or tumult
(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness
an unhappy and worried mental state