I picked web site instead of website because it came back as a separate word on the keyword research tools I use. However when you use the key Pharisees with web site Google ask if the reader meant to use the word website.. If they scroll down without clicking on did you seam website my ranking is higher then my ranking is higher and they click on did you mean website my ranking is much further down or not in the first 2 pages. Should I change the key praises with web site to website so the reader looking on a search engine will not have a choice to click on did you mean website or try to make a page with similar content using website as the primary keyword?
From my end, Google.com accept both website and web site without any question . So you maybe want to chose a keyword which is searched more often.