רֹאשׁ rôʼsh (H7218)

the head (as most easily shaken), whether literal or figurative (in many applications, of place, time, rank, itc.)

1) head, top, summit, upper part, chief, total, sum, height, front, beginning 1a) head (of man, animals) 1b) top, tip (of mountain) 1c) height (of stars) 1d) chief, head (of man, city, nation, place, family, priest) 1e) head, front, beginning 1f) chief, choicest, best 1g) head, division, company, band 1h) sum

from an unused root apparently meaning to shake;