Difference between Suddenly and Abruptly

SUDDENLY vs ABRUPTLY: ADVERB

Precipitously.
In an abrupt manner; without giving notice, or without the usual forms; suddenly.
Quickly and without warning

Without premeditation
On impulse
In zoology, sharply; abruptly; squarely: as, a part suddenly truncate.
In a sudden or unexpected manner; unexpectedly; hastily; without preparation or premeditation; quickly; immediately.

On impulse; without premeditation
With an abrupt termination.
Suddenly, without giving notice, or without the usual forms: as, the minister left France abruptly.
Precipitously, or with a very steep slope: as, the rocks rise abruptly from the water's edge.
Brokenly; by breaking or being broken off suddenly: as, the path or the discourse ended abruptly.

Rudely, Tragically, Precipitously, Dramatically, Rapidly, Quickly, Then, Unexpectedly, Mysteriously, On the spur of the moment, Of a sudden, All of a sudden, Short, Dead, Abruptly

Brutally, Rapidly, Steeply, Rudely, Violently, Sharply, Quickly, Dramatically, Drastically, Hastily, Precipitously, Unexpectedly, Dead, Short, Suddenly

Brutally, Perhaps, Now, Surprisingly, Immediately, Tragically, Precipitously, Dramatically, Rapidly, Quickly, Then, Mysteriously, Short, Dead, Abruptly

Rashly, Surprisingly, Brutally, Rapidly, Steeply, Violently, Sharply, Quickly, Dramatically, Drastically, Hastily, Precipitously, Dead, Short, Suddenly

Seriously, Latin suddenly became, not easy but easier.
My screen also suddenly cracked in two places.
But suddenly he sensed that something was wrong.
Gun control is suddenly a headline in Delaware.
Suddenly the President clutches his head in pain.
How do you right this suddenly listing lifeboat?
Your favorite cut of meat suddenly disgusts you?
So it was for nearly everyone, quite suddenly.
There were no more then than before and beside the problem came suddenly and went suddenly.
Suddenly, out of state contractors and cheaper foreign labor suddenly look much more appealing.

RESET_STREAM terminates one direction of a stream abruptly.
But that abruptly changed when he was detained.
Anne was eliminated rather abruptly as a result.
As for your ridiculous claims, then abruptly straightened.
Trump abruptly canceled a planned trip to Denmark.
Panicked, he abruptly dives, dipping into cloud cover.
White Health of Dallas, was abruptly called off.
Chris Matthews abruptly announced he was stepping away.
If you play through the beginning of the story at this point, the title appears abruptly and leaves the screen abruptly.
Meteorological drought can develop abruptly and stop abruptly.