Negotiates rhymes with:
appreciates, depreciates, differentiates, emaciates, instantiates, officiates, abbreviates, affiliate's, appreciates, appropriates, asphyxiates, delineates, depreciates, deviates, differentiates, emaciates, expatriates, herniates, humiliates, inebriates, infuriates, instantiates, misappropriates, obviates, officiates, permeates, radiates, recreates, repudiates, substantiates
Negotiates sounds like:
nacogdoches, nasdaq, nasdaq's, nast's, nastasi, naugatuck, necessitates, necessities, neckties, negates, nest-egg, nests, newscasts, newsday's, next's, niceties, night's, nighthawk, nighthawks, nights, nights', nonjets, nonstick, nugget's, nuggets