Talk:S Ultimate Booster 2: Miracle Fighters ～Miko & Mel～/@comment-4141313-20180710204650/@comment-4778017-20180712174704

Not really. Dungeon World is themed after elements you find in various RPGs (and had cards that tried to emulate mechanical elements of one) while Legend World derives its inspiration from various mythologies and legends. It's not quite the same subject matter, even if RPGs and various Fantasy stories can use myths and legends as inspiration.

As for the original question, Fantasy World could have indeed been a better choice of name but that's an answer based on knowing what we know today. Bushiroad planned DunW to be the RPG-theme world and Dungeon is more directly evocative of that than Fantasy which covers more and while they may have had ideas for the future, it's doubtful they could have known exactly how things would go. (Plans can change after all.)