Ottum rhymes with:
bottom, cottam, cottom, higginbottom, accustom, ageratum, antemortem, arboretum, argosystem, atom, autumn, bantam, biosystem, bottom, cablesystem, centum, chatham, cheatham, cheatum, chittum, cottam, cottom, custom, datum, dictum, eastham, ecosystem, frantom, haltom, higginbottom, infinitum, item, kortum, lineitem, mentholatum, momentum, mortem, partum, phantom, quantum, rectum, sanctum, sense-datum, statum, stratum, subsystem, symptom, system, tatom, tatum, techsystem, telesystem, totem, ultimatum, ultrasystem, verbatim, victim, wintom
Ottum sounds like:
o'donohue, oatman, odden, odem, oden, odeon, odiaum, odiaun, odin, odom, odonohue, odum, ooten, otani, othman, otten, ottman, ottoman, outdone, outen, outman, outten