So as if I had nothing better to do, here are the words (actually free morphemes) that appear in multiple card/event/landmark names. Any errors are my own.
10:
Village (or 11: Villa, if you consider village to be decomposable into villa + -age)
8:
Castle
6:
Market
Trade
5:
Dame
Merchant
Sir
4:
House
Hunt
Treasure
3:
Art (counting art as a constituent of artificer and artisan)
Bandit
Camp
City
Court
Duke (assuming duchy and duchess are decomposable into duke + -y, -ess)
Farm
Ground
Land (counting land as a constituent of island)
Man
Mine
Royal
Room
Ruin
Ship
Smith
Work
2:
Black
Bridge
Caravan
Copper
Count (not really, the nobleman count and the verb count as in counting house are unrelated homonyms)
Cut
Estate
Fair
Fort (assuming fort as a constituent of fortress)
Fortune
Gold
Grand
Hag
Haunt
Iron
Keep
King
Library
Lose
Make
Noble
Party
Pass
Post
Prince
Rat
Road
Scout
Sea
Secret
Stone
Tax
Tell
Tower
Triumph
Wall
Way
Witch
Wood
Yard
EDIT: Oh, and I guess function words too:
5: of
2: out, over, the