This is the 16630th most frequent Russian word.
сено
Hay.
Here, 'сено' refers to hay as a type of dried grass used for animal feed.
Я купил сено для кормления овец.
I bought hay to feed the sheep.
In this sentence, 'сено' indicates hay as a physical material stored in a barn.
В сарае было много свежего сена.
There was a lot of fresh hay in the barn.
Here, 'сено' is used to describe hay as a comfortable bedding material or setting.