FURTHEST — СИНОНІМІЯ

furthest (comparatives of `far'') most remote in space or time or order

WordNet

furthest to the greatest distance in space or time (`farthest'' is used more often than `furthest'' in this physical sense)

WordNet

furthest to the greatest degree or extent or most advanced stage (`furthest'' is used more often than `farthest'' in this abstract sense)

WordNet