根 - root, radical, head (pimple)

root; basis; foundation

foundation; root; basis; core; fundamentals

inquisitively; pryingly; nosily; thoroughly; persistently; through-and-through

root; source; origin; cause

laying the groundwork; behind-the-scenes maneuvering; consensus-building process

root (of a plant)

roof

to come from; to have roots in

patience; perseverance; persistence; tenacity; energy

basis; grounds; foundation; reason; authority

firmly rooted; deep-seated

eradication; extermination; rooting out; stamping out; getting rid of