neighbor
n. countablen. a person who lives very near you, usually in the house or apartment next door. You can also use it to describe a country that is next to another one.
n. a person living in proximity to another; specifically, one residing in an adjacent or nearby house or building. Often used figuratively to refer to a bordering nation or an object situated nearby.
My neighbor is very friendly and often helps me with my garden.
The noise from the upstairs neighbor made it difficult for the family to sleep through the night.
While the two countries have been peaceful neighbors for decades, recent disputes over water rights have strained their diplomatic relationship and increased border security.
Commonly used with the preposition 'to' when describing proximity ('a neighbor to the school').