The word "barbarianism" uses 12 letters: aaabbiimnrrs.
barbarianism is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for barbarianism in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
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Words formed by adding one letter before or after barbarianism (in bold), or to aaabbiimnrrs in any order:
s - barbarianisms