Using movie names/song titles

I have the same concern. For example, my game system includes a card called "Star Trek" which involves using random letters to spell the name of a star (celestial or human). Both "star" and "trek" are normal English words, and my game task in no way resembles the concept of the television programs or the movie franchise, except that it includes these words. I believe this falls under the "fair use" rubric in that it does not confuse players with the other, previous uses of the terms, even if it responds to a cultural item which is well-known to the players. Normal English words like "monopoly" and "boggle" would also fit into this rationale; terms such as "scattergories" or "pictionary" would not, however.