There is no one rootword.
The word "checkmate" is from the 1300s and comes from the Arabic "Shah Mat" meaning the king is dead. Mat meaning dead.
The word "stalemate" is from the late 1700s and takes the French word "estale" meaning standstill.
shim
nurse
Fasten.
bully
somthing
Audit
moral
Grintled ?
biodegrate
entertain
Cloud
un