ljlcdl and Ala Dan...aka Beavis and Butthead...
I don't care what you call them but be happy being wrong...It seems to me that Eagle, Uncle Mike's, Hogue, Ahrends, Spegel, Ajax, hell...even the Brownells catalog index all are perfectly happy with the term grips. Some have even named their company using the term. A stock goes on a rifle or shotgun. A grip goes on a pistol.