/ Thesaurus / F Synonyms of foundation stone Find synonyms for: Noun1. foundation stone, stoneusage: a stone laid at a ceremony to mark the founding of a new buildingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language