What is the suffix for far?

There isn't a direct suffix for "far" in English. However, there are ways to add a suffix to create related words:

* -ther: This suffix is used to form the comparative form of "far", which is farther.

* -thest: This suffix is used to form the superlative form of "far", which is farthest.

* -ness: This suffix can be added to "far" to create the noun farness, which means "great distance".

It's important to note that "further" and "furthest" are also used as comparative and superlative forms of "far", but they are typically used in more abstract contexts, such as "further information" or "the furthest point".