furthermost vs farthermost

furthermost and farthermost both are adjectives.

Word	Noun	Adjective	Verb	Adverb
furthermost	No	Yes	No	No
farthermost	No	Yes	No	No

As adjectives, furthermost and farthermost are synonyms defined as:

furthermost and farthermost: (comparatives of `far') most remote in space or time or order

Other synonyms of furthermost include farthest, furthest, utmost, uttermost.

furthermost (adjective)	farthermost (adjective)
(comparatives of `far') most remote in space or time or order	(comparatives of `far') most remote in space or time or order