I just stumbled upon this little known secret.
It appears that SE's recognize keyword.com the same as key-word.com and that also hold true for ke-yword.com.
The little testing I did on this is doesn't appear it matters where the "-" is in the url. so if you only care about SE's and not users, you can purchase virtually any word or phrase you want and place a hyphen in the word.
At the time of writing this c-omputers.com is available
but w-ebsite.com and s-ex.com is taken, apparently someone already knew about this.