It amazes me that the word riever is not in the spellcheck dictionary. while I know that it is a bit arcane, there is actually a college whose mascot is-gasp-a riever! Their sports teams are known as the Iowa Western Rievers, for crying out loud.
What is a riever? A riever is a river pirate. they sail up and down rivers raiding trade along the river. But, of course, spellcheck has no mechanical clue that the word actually exists. Really? Really???
I thought they loaded every word in the dictionary, important or no, into the damn program. hmmm….