fair, fare [doublet], phare.
fir, fur.
feet, feat (s.), feat (adj. obs.).
filter, philtre.
fit (befit), fit (conflict), fytte [obs.].
flag (v.), flag (ensign), flag (plant), flag (-stone).
flee, flea.
flow, floe.
flock (herd), flock (of wool).
flue (chimney), flue (velu), flew (fr. fly).