/ Thesaurus / W Synonyms of window box Find synonyms for: Noun1. window box, boxusage: a long narrow box for growing plants on a windowsillWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language