7 letters · 15 points in Scrabble
originBlend of friend + enemy. Invented independently multiple times. Attested in 1952 without any scare quotes or self-referential apology, clearly suggesting that the writer expected his audience to be unsurprised by encountering the word, but used by other writers in 1979 and 1992 in ways that indicate that those writers considered it a nonce blend and expected that their audiences would view it…
Etymology from Wiktionary, CC BY-SA 3.0