THE CONCRETE ROUNDABOUT (TCR)

As you suspected, that's a 'false group'. But thanks for taking one for the team.

Although, just because that was a false group, it doesn't mean there isn't a hidden Cricket group in there somewhere.

Smooth. Root. Pound. Star.
Warne. Pow-wow. Meal. Bearded.
Gooch. Rough. Boo. Number.
Lille. Butt. Mile. Border.

I don't know much, but I know my dog breeds.

Smooth, Bearded, Rough and Border are all types of Collie

Yes, that's a group. Well spotted.
And knowing about dogs might help with another of the groups.

Root. Pound. Star.
Warne. Pow-wow. Meal.
Gooch. Boo. Number.
Lille. Butt. Mile.

Right! In which case how about a further canine group made by changing a letter

Gooch - becomes pooch
Pow - wow - becomes bow-wow
Butt - becomes mutt
Pound - becomes hound

Unless I'm barking up the wrong tree?

And would that mean that we have a group made by adding square as a prefix?

Square root, square meal, square mile, square number

Great work. Both correct.

Which just leaves: Warne, Star, Boo, Lille.

Howzat! That must mean its the cricket again, add a letter to reveal a wizard of Oz:

Add c to star to become (Mitchell) Starc
Add r to Warne to become (David) Warner
Add n to Boo to become (David) Boon
Add e to Lille to become (Dennis) Lillee

Yes, that's the Cricket one. Well solved.

Damn! Totally missed this as I've been unavailable.

_________________
I don't need your ill-informed, half-baked, idiotic opinions. I have plenty of those myself.

New wall...

Castle. Battle. Ages. Bowling.
Flag. Sternum. Market. Replays.
Arrogant. Port. Master. War.
Bridget. Mother. Bails. Quay.