Letters that make frequency modulation
a, o, d, e, f, l, n, c, m, r, t, i, q, u, y are letters that make 'frequency modulation'
Words within frequency modulation
eq, OD, lat, re, la, ti, frequency, at, en, mod, on, modulation, LA, MO, NC, Io, ion, Re, At, Fr, La, Mo, Ti, mo are words within 'frequency modulation'