Letters that make prisoner's base
s, a, o, b, e, n, p, r, i are letters that make 'prisoner's base'
Words within prisoner's base
ER, prison, son, BA, PR, Base, prisoner, Ba, sone, SE, RI, base, one, on, as, so, AS, NE, Son, As, Er, Ne, Pr, Se are words within 'prisoner's base'