Correct spelling, explanation: neighbor and neighbour have the same meaning and refer to the same concept, which is a person who lives near you. However, their usage depends on the variety of English you are using. Neighbor is the standard spelling in American English and neighbour is the standard spelling in British English and in many other varieties of English, including Canadian, Australian, and New Zealand English. If you are writing in any of these varieties of English, or if you are following British English conventions, you should use the word neighbour.

Definition of neighbour:
noun, a person living next door to or very near to the speaker or person referred to
Our new neighbour welcomed us to the neighborhood with a basket of freshly baked muffins.
The neighbourhood is known for its friendly and close-knit community, where neighbours often help each other in times of need.

Collocations with neighbour:
Some most commonly used collocations include:
1. Neighbourhood watch: a community-based program where neighbours collaborate to enhance safety and security in their neighbourhood.
We’re considering starting a neighbourhood watch to address recent security concerns.
2. Good neighbour relations: refers to the quality of relationships and interactions between neighbours in a community.
Maintaining good neighbour relations is essential for a harmonious living environment.
3. Neighbourhood party: a social event or gathering organized within a neighbourhood to promote community bonding and camaraderie.
An annual neighbourhood party is always a fun event with games and food for everyone.
4. Close neighbourhood: refers to an area or locality where the houses or buildings are situated closely together, often used in real estate or property descriptions.
This house is in a close neighbourhood with easy access to schools and parks.

Correct spelling, explanation: neighbor and neighbour share the same root. Both words ultimately have their origins in Old English and Middle English. Neighbor (without the -u) is the spelling that evolved in American English. It can be traced back to the Old English word neahgebūr, where neah meant near and gebur meant dweller or inhabitant. Neighbour (with the -u) is the spelling that evolved in British English and many other varieties of English. It also has its roots in Old English, with neah and gebur having the same meanings.