The difference between Joke and Witticism

When used as nouns, joke means an amusing story, whereas witticism means a witty remark.

Joke is also verb with the meaning: to do or say something for amusement rather than seriously.

check bellow for the other definitions of Joke and Witticism

Joke as a noun:

An amusing story.
Joke as a noun:

Something said or done for amusement, not in seriousness.

Examples:

"It was a joke!"
Joke as a noun (figuratively):

The root cause or main issue, especially an unexpected one
Joke as a noun (figuratively):

A laughably worthless thing or person; a sham.

Examples:

"Your effort at cleaning your room is a joke."

"The president was a joke."

Joke as a verb (intransitive):

To do or say something for amusement rather than seriously.

Examples:

"I didn’t mean what I said — I was only joking."
Joke as a verb:

(intransitive, followed by with) To dupe in a friendly manner for amusement; to mess with, play with.

Examples:

"Relax, man, I'm just joking with you."
Joke as a verb (transitive, dated):

To make merry with; to make jokes upon; to rally.

Examples:

"to joke a comrade"