encephalogram vs. pneumoencephalogram
electroencephalogram vs. encephalogram
esophagoscope vs. oesophagoscope
excitability vs. excitableness
emotionlessness vs. unemotionality
effusiveness vs. expansiveness
exchangeability vs. interchangeability
exchangeability vs. interchangeableness
exchangeability vs. fungibility
electronegativity vs. negativity
effectiveness vs. effectualness
effectiveness vs. effectuality
ephemerality vs. ephemeralness
exorbitance vs. outrageousness