Fun

fun
fən/Submit
noun
1.
enjoyment, amusement, or lighthearted pleasure.
"the children were having fun in the play area"
synonyms: enjoyment, entertainment, amusement, pleasure; More
adjectiveinformal
1.
amusing, entertaining, or enjoyable.
"it was a fun evening"
synonyms: enjoyable, entertaining, amusing, diverting, pleasurable, pleasing, agreeable, interesting
"a fun evening"
verbNORTH AMERICANinformal
1.
joke or tease.
"no need to get sore—I was only funning"

Source: Google

the children were having fun in the play area

"it was a fun evening"

"no need to get sore—I was only funning"