Farthest is a term that is commonly used to describe the distance between two objects or points. However, there are several other words that can be used to convey the same meaning. One such word is the word 'most distant', which can be used to describe the furthest distance between two points. Another synonym for 'farthest' is 'outermost' which refers to the extreme limit or boundary of something. Additionally, the word 'remotest' can be used to describe a distance that is beyond reach or difficult to access. Other words that can be used interchangeably with 'farthest' include 'ultimate', 'utmost', 'extreme', and 'outlying'.