I was hoping for FRIBBLERS, but MWOD10 doesn't allow it. Aaawh.
There are at least eight words that can follow HEARTHS.
By the way, Bib, another new rule for the game is that if 12 hours go by since a player posted the last correct entry, that player can submit another word. (aka The 12-Hour Rule).
There is at least one word that can follow SHEATHERS.