Antarctica
Bank
Bomb
Bond
Buck
Buffalo
Court
Deck
Degree
Dress
Fence
File
Grass
Hood
India
Ivory
Piano
Pool
Port
Queen
Robot
Satellite
Shark
Spell
Whip
Buffalo for big mammal? Queen/Antarctica for Australia reference? (Not 100 % Australia is commonwealth but I'll go for it anyway.) These 3 seem to be the most straightforward ones.
Things I'm considering to guess if those are not all blue are hood (jumper/they have some weird hoodie on, maybe hood is Australian slang?) and shark (animal), maybe whip/file/bond/degree but those seem far fetched.
Kangaroo court is definitely a thing in the U.S. My familiarity with it is from baseball -- players holding court and fining other players for doing stupid ****.
Guess we're switching spymasters and moving on to game 2?