The word "barratries" uses 10 letters: aabeirrrst.
barratries is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for barratries 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 barratries (in bold), or to aabeirrrst in any order:
g - arbitragers
Shorter words found within barratries