• 大衆たいしゅう — general public
• 群衆ぐんしゅう — crowd; mob
• 観衆かんしゅう — audience; spectators
• 聴衆ちょうしゅう — audience (listening)
• 民衆みんしゅう — the people; citizens
• 公衆こうしゅう — the public

衆 depicts many individuals gathered as one body. Historically it signified a group with shared identity or purpose; today it shows up in social and political terms, from 群衆 (crowd) to 衆議院 (House of Representatives).

群衆ぐんしゅうが 駅前えきまえに 集あつまっている。
A crowd is gathering in front of the station.

彼かれは 衆議院しゅうぎいんの 議員ぎいんです。
He is a member of the House of Representatives.