Nitro rhymes with:
citro, fittro, mitro, vitro, astro, austro, belcastro, bistro, buenrostro, castro, centro, cilantro, citro, decastro, delmastro, depetro, depietro, detro, dextro, dipietro, disilvestro, dutro, dutrow, electro, fetrow, fittro, gastro, giampietro, haberstroh, intro, jetro, locastro, maestro, magistro, mastro, mastropietro, mitro, nicastro, paternostro, petro, pietro, policastro, quattro, retro, santopietro, silvestro, spilotro, sulpetro, sutro, tatro, teatro, tetro, verrastro, vitro, yastrow, zastrow
Nitro sounds like:
n'dour, nader, nadir, natter, nature, neater, neathery, nedrow, needier, neider, neither, nether, nethery, netter, netware, neuter, nieder, niederer, notaro, notary, noteware, nother, notre, notter, nutri, nutria, nutter