Grandeur rhymes with:
doer, well-doer, coeur, doer, fuer, kapoor, koor, majeure, mccluer, mcclure, mclure, pasteur, raconteur, rigueur, secteur, ure, voyeur, well-doer, yoor
Grandeur sounds like:
gerrymander, grander, grantor, grantree, grinder, grounder, groundwater, grunder, guarantor