Letters that make undeterminable
a, b, d, e, l, n, m, r, t, i, u are letters that make 'undeterminable'
Words within undeterminable
ER, term, AB, ab, mi, te, Min, UN, MI, nab, determinable, able, terminable, in, mina, DE, IN, ND, LE, Er, In, Nd, Na, Te, Ab, min, deter are words within 'undeterminable'