freezing-point
freight
freight-all-kinds
freight-car
freighter
freight-hauling
french
Frenchman
Frenkel
freon
  frequency
frequency-agile
frequency-band
frequency-change
frequency-changer
frequency-changing
frequency-channel
frequency-channellized
frequency-chirped
frequency-controlled
frequency-dependent

    frequency fluctuation

     флуктуации частоты

     нестабильность частоты