Flagging rhymes with:
reflagging, unflagging, lagging, reflagging, unflagging, bagging, bragging, dragging, lagging, nagging, reflagging, sagging, snagging, tagging, unflagging, wagging
Flagging sounds like:
falcons, feliciano's, felkins, filkins, flaking, flashguns, flashing, fleecing, flexing, flicking, flocking, flogging, flushing, foolishness, fulgencio