Don't get the card suits group?

Hi Mike, Sorry about that - I've now added a more detailed description in the answer. :)

Why did ghost not work?

The card suit one just doesn’t work for me - they aren’t anagrams, they aren’t in order - altogether a messy connection

Otherwise a good grid

Might be worth tweaking what is accepted for the ghost group.

Yeah, the cards group doesn't really work. Just having the letters in there somewhere to spell four arguably connected words is far too weak of a connection. Using that logic you could probably come up with endless connections for any random group of four words: e.g. from the Skyfall group you can create the words "mite", "mouse", "yak" and "canary", and call the link "animals".

The rest I thought was fine.

Thanks for the feedback everyone - this was my first attempt so will take it on board.

Decent for a first effort