Here's what rhymes with lightweigh.
way weigh whey wei they may day away say pay play re lay j array bay gay k pray ray che hay nay prey sway tray fay fe yea dey hey ley rei sei bj bk drei jay kc lei payee rea rj tae tj tre zwei bey bray dray neigh brae cay fey roue shay trey aweigh stay today delay clay decay essay gray grey obey okay spray ballet stray fray oj slay allay bouquet ij ok passe sleigh fj replay flay belay hideaway splay byplay moray purvey toupee noway aurae layaway reweigh spay survey anyway betray cafe dismay halfway repay astray runaway underway valet attache defray disarray fillet waterway cabaret dossier gangway naturae puree saute alleyway getaway parquet risque soiree wordplay carriageway filet inveigh throwaway airplay nisei prepay sachet stowaway flyaway hooray urethrae briquet hurray outplay outstay umbrae copay tearaway respray display convey yesterday portray cliche disobey faraway lamellae overlay papillae passageway protege francais matinee toothache underlay breakaway crochet croquet lingerie souffle straightaway workaday caraway castaway giveaway ricochet patellae pleurae resurvey sorbet soubriquet takeaway overpay overplay roundelay sickbay medullae underpay bobsleigh foldaway misplay walkaway everyday holiday interplay vertebrae sequelae emigre microarray nebulae fistulae sobriquet fibulae stingray underplay overstay caesurae uvulae copulae cybercafe formulae naivete societe maxillae scapulae cabriolet macrame penumbrae tarantulae communique trabeculae salmonellae companionway caravanserais