Letters that make background knowledge
a, o, b, d, e, g, k, l, n, c, r, u, w are letters that make 'background knowledge'
Words within background knowledge
edge, ground, LED, BA, UN, Ba, know, AC, dg, Ro, ledge, kg, ED, round, no, now, back, knowledge, owl, background, ND, LE, Ac, Ge, Nd, No are words within 'background knowledge'