far vs farther

far and farther both are adjectives.

Word	Noun	Adjective	Verb	Adverb
far	No	Yes	No	Yes
farther	No	Yes	No	Yes

far (adjective)	farther (adjective)
located at a great distance in time or space or degree	more distant in especially space or time
beyond a norm in opinion or actions	more distant in especially degree
being of a considerable distance or length
being the animal or vehicle on the right or being on the right side of an animal or vehicle

far (adverb)	farther (adverb)
at or to or from a great distance in space	to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense)
remote in time	to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense)
to a considerable degree; very much
at or to a certain point or degree
to an advanced stage or point