Belgians rhymes with:
allergens, antigens, cajuns, carcinogens, collegians, dungeons, engine's, engines, georgians, hodgens, hudgens, hydrogens, imagines, legions, margins, neurosurgeons, norwegians, pathogens, pigeon's, pigeons, region's, regions, religion's, religions, sturgeons, surgeon's, surgeons, theologians, trajan's, trojans, virgin's, virgins
Belgians sounds like:
balchunas, balconies, balkanize, balkans, balking, belching, belgium's, bellyaching, bilking, blackening, blackens, blackmun's, blackness, blaesing, blakeney's, blasing, blazing, bleaching, bleakness, blessing, blessings, blocking, blossoming, blossoms, blowguns, bluejeans, blushing, bolognese, bolognesi, bulging, bullishness