9 letters · 17 points in Scrabble
noun use of two conjoined nouns instead of a noun and modifier
originFrom Medieval Latin, from Ancient Greek ἕν (hén), stem of εἷς (heîs, “one”) + διά (diá, “through”) + δύο (dúo, “two”), “one [idea] through two [words]”.
Etymology from Wiktionary, CC BY-SA 3.0