Letters that make overt operation
a, o, e, n, p, r, t, i, v are letters that make 'overt operation'
Words within overt operation
ER, opera, Opera, pe, ti, ERA, OV, ration, at, ratio, on, overt, over, operation, rat, RA, Io, ion, Ra, At, Er, Ti, ERT, era are words within 'overt operation'