6 letters · 9 points in Scrabble
verb invade in great numbers
verb occupy in large numbers or live on a host
verb live on or in a host, as of parasites
originFrom Middle English infesten, from Old French infester (“to infest”), from Latin īnfestō (“assail, molest”, verb), from īnfestus (“hostile”), of uncertain origin.
Etymology from Wiktionary, CC BY-SA 3.0