s, a, o, d, e, f, n, p, c, m, r, t, i, q, u, y are letters that make 'radio-frequency spectrum'
radio, eq, spectrum, spec, pe, re, ad, EC, frequency, rad, en, rum, AD, ECT, CT, RA, NC, Io, Ra, Re, Fr, Ru are words within 'radio-frequency spectrum'
1 possible definitions for 'radio-frequency spectrum'
Under this definition, radio-frequency spectrum is a noun and has the following properties:
radio spectrum has the same meaning as radio-frequency spectrum
'radio-frequency spectrum' can be a type of spectrum.
'radio-frequency spectrum' can be a part of electromagnetic spectrum.
radio wave, radio emission, radio radiation are parts of 'radio-frequency spectrum'.