Yes, you want a different type of description for investors: you want to err on the side of explaining it in terms of stuff they already know.

In fact, I explicitly tell YC startups to explain themselves to investors as "the x of y" whenever possible. See point 14:

http://www.paulgraham.com/investors.html

The reason I've been so contemptuous of some of the comments on this thread is that I've been seeing the identical comments on web forums for 5 years. That's how I can be sure they're not a sign of a problem. They're just the same type of people making the same type of comments that always get made about newly launched startups.