Mainly rhymes with:
humanely, ainley, hainley, humanely, plainly, rainley, ungainly, vainly, ainley, benignly, brazenly, brinlee, brinley, brownlee, brownley, brownlie, burnley, carnley, certainly, chanley, charnley, clandestinely, cleanly, commonly, conely, conlee, conley, conly, connely, cranley, danley, danly, denley, divinely, donley, dunley, evenly, farnley, fenley, finely, finlay, finley, ganley, gentlemanly, genuinely, ginley, greenley, greenly, hainley, hanley, hanly, heavenly, heinly, henley, henly, hinely, humanely, humanly, hunley, keenly, kenley, kinley, linley, lonely, mackinley, manley, manly, matronly, mcginley, mckinlay, mckinley, mistakenly, munley, nunley, onley, only, openly, penley, plainly, quinley, rainley, ranley, routinely, schenley, shanley, slovenly, spokenly, stanley, stanly, sternly, stubbornly, suddenly, thinly, thornley, tinley, townley, turnley, uncertainly, uncommonly, unevenly, ungainly, vainly, wantonly, wernli, winstanley
Mainly sounds like:
mahal, mahala, mahalah, mahalia, mahila, mahl, mahle, maiello, mail, maile, mailey, maille, maiolo, mal, mala, malawi, malay, male, maley, mali, malia, mall, malle, malley, mallia, mallie, mallo, mallow, malloy, mally, malo, maloy, maly, mammal, mamula, manalo, manella, manhole, manila, manilla, manilow, manley, manly, mannella, manual, manually, manuel, manuela, manuele, manwell, maul, maule, maull, mayall, mayhall, mayle, meal, mealey, mealo, mealy, meanwhile, meehl, mehall, mehl, mehle, mehul, mel, mele, melee, meli, melia, melillo, mell, mella, melle, melley, melli, mellie, mello, mellow, melly, melo, meloy, memel, memoli, meneely, menial, menil, menlo, mennella, meola, miele, mihal, mihaly, mil, mile, miley, milieu, mill, millau, millay, mille, milley, milli, millie, milloy, milly, milo, minella, minelli, mineola, minimal, minimally, minimill, minnelli, minoli, moehle, mohel, mohl, mol, mola, mole, molehill, moll, molle, molley, mollie, mollo, molloy, molly, moly, monell, monohull, moul, mowell, moyl, moyle, muehl, muhl, mula, mule, mulhall, mull, mullah, mullally, mullaly, mulloy, munley, munnell, muolo, myla