Letters that make authentication
a, o, e, n, c, h, t, i, u are letters that make 'authentication'
Words within authentication
he, ti, NT, IC, He, AU, at, en, ut, authentic, on, ic, then, cat, CAT, hen, CA, cation, Io, ion, tic, At, Ca, Au, Th, Ti, UT are words within 'authentication'