/ Thesaurus / S Synonyms of sif Find synonyms for: Noun1. Sifusage: (Norse mythology) wife of Thor and guardian of the homeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language