/f/as in "for"

afford, coffee, difference, different, difficult, off...

caffeinated, chauffeur, cliffe, coiffe, differently, gaffe...

christopher, joseph, phil, phoebe, phone, photo...

after, before, find, first, for, from...

carafe, circumference, conferencing, lifelike, lifeline, lifetime...

cough, draught, enough, laugh, rough, slough...

dubrovsky, gradchev, gradov, gustav, kafelnikov, khabarovsk...