As long as a domain name is easy enough to be remembered (so that you can visit it without clicking a link), the name doesn't really matter. The origin of businesses' names are a nice anecdote, but they hardly decide over success (unless the name is offensive in other languages). Google is an example where the name is very easy to remember whereas the connection of the name and the search business is not very intuitive to most.
So choose a word that people can remember and know how to write, but it doesn't have to be connected to the nature of your business.