What's the difference?

Another sign that I am getting old! I woke up to answer nature's call
(Why do they call it that? I don't pee outside!) and then I couldn't get
back to sleep because of freeway/construction noise, which I don't misd
too much because we are getting a Costco right here in River City (Er, I
mean Smokey Point/ Arlington) - Now I don't have to drive all the way to
Mount Pilot to get a drum of chocolate covered raisins or a pallet of
laundry soap.

Anyway, I stayed just awake enough to ponder the difference between the
"incessant" noise and the "ceaseless" noise. But not awake enough to get
up and look it up.

Turns out it's exactly the same thing; but I think of the morning traffic
noise as "relentless" now.

Main Entry: incessant
Part of Speech: adjective
Definition: never-ending
Synonyms: ceaseless, constant, continual, continuous, endless, eternal,
everlasting, interminable, interminate, monotonous, non-stop, perpetual,
persistent, relentless, timeless, unbroken, unceasing, unending,
unrelenting, unremitting