Letters that make unserviceable
s, a, b, e, l, n, c, r, i, u, v are letters that make 'unserviceable'
Words within unserviceable
ER, ice, ICE, RV, AB, ab, vice, UN, IC, Service, SE, Ea, able, serviceable, vi, ic, CE, service, VI, LE, Ce, Er, Se, Ab are words within 'unserviceable'