dessertspoon vs. dessertspoonful
dermatomycosis vs. dermatophytosis
dermatosclerosis vs. scleroderma
dihydroxyphenylalanine vs. dopa
diethylstilbestrol vs. diethylstilboestrol
diethylstilbestrol vs. stilbestrol
diethylstilbestrol vs. stilboestrol
deoxyadenosine vs. deoxycytidine
deoxyadenosine vs. deoxyguanosine