This is the 9094th most frequent Russian word.
сад
Garden.
The word 'сад' refers to a garden in this sentence, a place where plants are cultivated and people can stroll.
Я гуляю по саду вечером.
I walk in the garden in the evening.
Here 'сад' refers to an orchard, a type of garden specifically for growing fruit trees.
В этом году мы посадили яблони в сад.
This year we planted apple trees in the orchard.
In this context, 'сад' is part of the word 'садик', colloquially referring to a kindergarten, a place where young children engage in activities and learning.