Nonferrous rhymes with:
ferrous, ahasuerus, calveras, cerus, derose, embarrass, ferrous, heiress, marous, meris, peras, polaris, terrace
Nonferrous sounds like:
nabers, nabors, nebraska, nebraska's, nefarious, neiberg, nephrosis, neuburg, nevarach, nevarach's, nevarez, nevers, newberg, newbrough, newburg, newburgh, newbury's, nobrega, nobriga, nonmembers, noverco, npr's, npr.org, number's, numbers, nyberg, nyborg