Domain, with or without "-"

[debasis]

Hello,
I would like to buy a domain, consisting of two English words. Here's my question. With or without a hyphen in the middle? I mean WORD-WORD.COM or WORDWORD.COM
What do You think about it?

Between Two the without hypen domain is better than the other but just checked that the domain name WORDWORD.COM is already taken by other and the domain name WORD-WORD.COM is still available for purchase if you want you can buy it.
Thanks.