dishonorableness vs. dishonourableness
disreputability vs. unrespectability
disreputableness vs. unrespectability
domineeringness vs. imperiousness
discomposure vs. disconcertion
discomposure vs. disconcertment
downrightness vs. straightforwardness
delectability vs. deliciousness
delectability vs. lusciousness
delectability vs. toothsomeness
disharmony vs. inharmoniousness
digestibility vs. digestibleness
distressfulness vs. seriousness
directionality vs. directivity
defencelessness vs. defenselessness
defenselessness vs. unprotectedness
dilatoriness vs. procrastination
dispensability vs. dispensableness
dolichocephalism vs. dolichocephaly
diencephalon vs. thalmencephalon
diagonalisation vs. diagonalization
decomposition vs. putrefaction
decomposition vs. disintegration
deconstruction vs. deconstructionism
disenchantment vs. disillusion
disenchantment vs. disillusionment