furthest vs far

furthest and far both are adjectives.

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

furthest (adjective)	far (adjective)
(comparatives of `far') most remote in space or time or order	located at a great distance in time or space or degree
	beyond a norm in opinion or actions
	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

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