Letters that make passing tone
s, a, o, e, g, n, p, t, i are letters that make 'passing tone'
Words within passing tone
PA, tone, si, Pa, ton, ng, SI, SS, one, on, passing, as, in, pass, pas, sin, ass, AS, IN, NE, Sin, pa, As, In, Ne, Si, sing are words within 'passing tone'