This list of 18 letter words containing o has 34 entries. It may be helpful for people looking for words that contain O, and 18 letter words with o.
adventitiousnesses, antiadministration, antidiscrimination, biodegradabilities, bloodthirstinesses, cantankerousnesses, chemotherapeutical, counteraccusations, counteraggressions, counterpropagation, counterretaliation, counterrevolutions, countersuggestions, electrocardiograms, electrocardiograph, heterogenousnesses, hydroelectricities, hyperconscientious, hypernationalistic, industrializations, interinstitutional, internationalizing, irresponsibilities, misinterpretations, misrepresentations, nondiscriminations, obstreperousnesses, postfertilizations, rehospitalizations, simultaneousnesses, straightforwardest.
subclassifications, subconsciousnesses, unscrupulousnesses,
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