This is the 8720th most frequent Russian word.
перголо
The Russian word "перголо" does not exist. It might be a typo or misunderstanding.
Here, 'перголо' is used as a noun referring to a structure in the garden.
Перголо было построено в саду для отдыха.
The pergola was built in the garden for relaxation.
In this sentence, 'перголо' is the object of the prepositional phrase indicating location.
Мы сидели под перголо, наслаждаясь видом.
We were sitting under the pergola, enjoying the view.
Here, 'перголо' again is a noun and is the object of the action 'to decorate'.