Number's rhymes with:
numbers, outnumbers, numbers, outnumbers, ambers, chamber's, chambers, chambers', december's, embers, fimbres, limbers, member's, members, members', nonmembers, november's, numbers, outnumbers, remembers, september's, timbers
Number's sounds like:
nabers, nabors, nebraska, nebraska's, nefarious, neiberg, nephrosis, neuburg, nevarach, nevarach's, nevarez, nevers, newberg, newbrough, newburg, newburgh, newbury's, nobrega, nobriga, nonferrous, nonmembers, noverco, npr's, npr.org, numbers, nyberg, nyborg