～園
～えん · ～en · JLPT N2 · noun
garden
🌷🌳 ～en sounds like enclosed: the 囗 frame is the fence around a garden
The outer box 囗 means enclosure, and the inner part 袁 gives the sound en. As a suffix it names fenced grounds built for a purpose: 公園 kōen (park), 動物園 dōbutsuen (zoo), 幼稚園 yōchien (kindergarten).