Ne'er rhymes with:
billionaire, concessionaire, debonair, doctrinaire, ensnare, finnair, glenayre, knerr, macnair, mcnair, millionaire, multimillionaire, nair, nationair, questionnaire, snare
Ne'er sounds like:
nair, naira, namara, namer, nara, naro, narrow, narrower, nary, nauer, nayyar, near, nearer, neary, neer, neher, nehru, neier, neimeyer, neira, nemer, nemir, neri, nerio, nero, neuer, neumaier, neumayer, neumeier, neumeyer, neuner, neuro, neurohr, newer, newmeyer, newmyer, neyer, niemeier, niemeyer, nier, nimmer, niner, nir, niro, nohr, noir, nomura, nor, nora, norah, norrie, norry, norway, nowhere, numeiri, nunnery, nur, nurr, nurre, nyerere, nyeri