This is the 2892nd most frequent Japanese word.
びん
"びん" means "bottle" or "flight/transport connection" depending on the context.
In this sentence, 'びん' is part of the word '花瓶' (花: flower, 瓶: bottle/vase), which refers to a 'vase'.
昨日、花瓶が割れてしまいました。
Yesterday, the flower vase broke.
Here, 'びん' in '瓶' means a jar or bottle used to hold liquids like water.
夕飯のときに水の瓶を持ってきた。
Brought the water jar during dinner.
In this context, 'びん' is part of '郵便' (郵: mail, 瓶/便: convenience/route), referring to 'mail'.