Noun (short for noun)

People or things that are entertaining, joking, laughing and interesting.

intransitive verb

crack a joke

Adjective (abbreviation for adjective)

For entertainment.

delight

Noun (short for noun)

Play; naughty

This puppy is very interesting.

This puppy is very naughty.

Entertainment; happy

Have fun at the party tonight.

I had a good time at the party tonight.

Playing cards all night is boring.

Playing park cards all night is boring.

joke

He likes joking.

He likes jokes.

Part of speech change

intransitive verb

Activities; Operation; work

My pen doesn't work well.

My pen is not very smooth.

If you don't refuel this old machine regularly, it won't work properly.

That old machine won't work properly unless it is refueled regularly.

This machine tool is not working properly.

There is something wrong with this machine tool.