The word "basenesses" uses 10 letters: abeeenssss.
basenesses is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for basenesses in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
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Shorter words found within basenesses
ab abs ae an ane anes as ba ban bane banes bans bas base be bean beans bee been bees ben bene benes bens ease en ens es na nab nabe nabes nabs nae ne neb nebs nee sab sabe sae sane sea see seen sen sene