群衆
ぐんしゅう · gunshuu · JLPT N1 · noun
group
群 (herd, flock) + 衆 (masses, multitude) = a herd of masses = crowd
群 is a herd or flock, as in 鳥の群れ (a flock of birds). 衆 means the masses or multitude, as in 大衆 (the general public). Joined together, they name a crowd or group of people.
群 — 君 jūn (phonetic) + 羊 sheep (semantic)
群 is a phono-semantic compound. The 羊 (sheep) component gives the meaning — sheep naturally gather in flocks — while 君 (jūn) supplies the sound. From the literal sense of a flock, the meaning broadened to any group, crowd, or cluster of people or things.