I'm out of possibilities unless one of the words was scored wrong. every vowel but y has been eliminated and we know there is an S.
So the word has to be 4 letters with only a Y as a vowel and an S somewhere other than the 1st spot. The only words I know of that fit this have a w in them as well, so if whys only scored 2 I don't have anything else.
Hopefully my logic helps someone else :-p