8 letters · 14 points in Scrabble
originFrom Middle English dydoppar, from earlier douedoppe, deuedep, dyuedap with agentive suffix -er, from Old English dūfedoppa (“diving bird, pelican”), from dūfan (“to dive”) + *doppa (“diver”) (whence modern English dop (“diving bird”)). By surface analysis, dive + dop + -er.
Etymology from Wiktionary, CC BY-SA 3.0