noun
Refers to a single gathering or cluster of people, animals, or things. Often used for a visible, countable group.
公園に一群れの鳩がいた。
There was a flock of pigeons in the park.
駅前に一群れの人が集まっていた。
A crowd of people had gathered in front of the station.
noun
wide expanse (of flowers)
Used for a broad, visually striking spread of flowers, often in a natural setting. Less common than the group sense.
丘の斜面に一群れの菜の花が咲いていた。
A wide expanse of rapeseed flowers bloomed on the hillside.