footloose and fancy free
footman
footnote
footpath
footprint
footrest
footstep
footstool
footwear
footwork
fop
foppish
for
for a change
for a lark
for a little
for a long time
for a moment
for a quarter of the price
for a rainy day
for a short time
for a song
for a start
for a while
for all i know