This is the 8617th most frequent Japanese word.
放鳥
Release of a bird.
Numeric usage of "放鳥" refers to the action of releasing birds.
公園では毎朝、鳥の放鳥が行われます。
In the park, birds are released every morning.
"放鳥" here specifically refers to the act of having released a single pigeon.
放鳥されたハトが空高く舞い上がった。
The released pigeon soared high into the sky.
"放鳥" represents the organized activity or event of releasing birds into their natural habitat.