Not easy finding a five letter word ending with S where the other 4 letters are not a noun...
Anyway here's one guess. HAVE and HAVES.
The latter is used as a single noun meaning people with wealth: "the haves and the have nots". Also, HAVE is not used to mean a single person with wealth, you would say instead "he is one of the haves".
2nd person singular of HAVE is HAS.