Yea, quite a few lists do limit it to 3 words. Some go to 4, and a few will allow up to 5 (like myself).
What I'd do is get a base title of 3 words for the widest acceptability, then add one word to the end of the title on the page. That way, you have a bit more flexibility for those lists that will accept 4. I doubt reviewers at the 3 word limit sites will decline for having that 4th word at the end of the title onpage. Hope that makes sense
