6 letters · 10 points in Scrabble
noun slang for sexual intercourse
originPossibly from or related to German Nuckel (“pacifier; teat”), nuckeln (“to suck”), both attested from the 17th century, in which case the German brand name NUK, though officially an acronym, could be named after the generic word.
Etymology from Wiktionary, CC BY-SA 3.0