I'd have thought the opposite would be a more accurate comparison: Disney claiming "Pirates!" as similar to/confusable with "Pirates of the Caribbean" (discounting any issues of who actually owns what trademarks in reality just now).

No mention of the issue is complete without a reference to Tim Langdell, and his hilarious suits against anyone using the word 'Edge' in their games[1].

[1] https://secure.wikimedia.org/wikipedia/en/wiki/Edge_Games