2491: republic Oct 7, 2021
There is a prefix 're-' used either for repetition ('reshape'), negation ('react'), or intensity ('resound'), and while 'public' is a word 'republic' fits none of those above categories. This is because it comes from a Latin phrase, effectively a compound from 'rēpūblicā', the ablative form of 'rēspūblica'—the nominative [subject] form—meaning 'matter/thing of the people'. The loss of -S- is because 'rēspūblica' is two words, which are both being declined separately, and the -S- of 'rēs' (thing) doesn't appear in the form borrowed into other languages.