Spelfabet

amoeba (US ameba)

coeliac (US celiac)

coelocanth

Croesus

diarrhoea (US diarrhea)

dyspnoea

foetus (US fetus)

gonorrhoea (US gonorrhea)

homoeopathy (US homeopathy)

monoecious (US monecious)

Oedipus

oestrogen (US estrogen)

oestrus (US estrus)

pharmacopoeia (US pharmacopeia)

phoenix (US phenix, except in Arizona)

Phoebe

Stilboestril

trioecious (US triecious)