‘Fun’ is a noun e.g.  I had a lot of fun 

‘Funny’ is an adjective e.g The joke was funny. She is a funny girl.

‘My holiday was relaxing. I felt really relaxed.’

Few, but common, adjectives end in either -ed or -ing:

worried / worrying, interested / interesting, excited / exciting

‘-ed’ adjectives

Adjectives that end in -ed are used to describe how people feel.
Examples:

‘He was surprised to find that he had been upgraded to first class.’
‘I was confused by the report.’
‘She felt tired after working hard all day.’ 

 ‘-ing’ adjectives

Adjectives that end in -ing are used to describe things and situations. Compare these example sentences to the ones above:

‘Being upgraded to first class is surprising.’
The findings of this report are confusing.’
‘Working hard all day is tiring.’ 

 Examples table:

Online activities:

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-48887.php 

Short quiz:  Click on the link: Short quiz: