15 letters · 19 points in Scrabble
originEtymology tree Middle English investigacioun English investigation Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English investigational From investigation + -al.
Etymology from Wiktionary, CC BY-SA 3.0