6 letters · 9 points in Scrabble
noun a sore that has become inflamed and formed pus
verb ripen and generate pus
originInherited from Middle English festre, festur, borrowed from Old French festre (cognate with Italian fistola, Occitan fistola, Spanish fístula), from Latin fistula. The verb is derived from the noun, while the “condition of something that festers” noun sense is derived from the verb. Doublet of fistula.
Etymology from Wiktionary, CC BY-SA 3.0