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