What matters most is whether or not people actually use the keyword when they search. If they do not use the word in searches, it doesn't matter if it's in the domain name. Are users using it with the other words you are targeting for the domain when they do a search?
Use the AdWords Keyword Tool to find out. That tools also gives you all of the best word combinations.
"It's inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians." -Henrik Ibsen