Further vs. Farther
Main DifferenceFurther and farther are commonly considered to be same in sense but are slightly different in meanings. Farther is used for the physical distance between two things. Further is the non-physical distance or for figurative distance. We can say how much your school is farther from this building?. This is the physical distance. When we say "Truth is not further", it is a figurative and non physical distance. Further is more diverse than farther. If you get confuse between "further" and "farther", you may use further, as it is a diverse term.

Difference Between Further and Farther
Further vs. Farther
Farther is used for the physical distance between two things while further is the non-physical distance or for figurative distance.
Further vs. Farther
Further is a diverse term while farther is a restricted term.
Further vs. Farther
Sun is further from earth and moon is farther.
Further vs. Farther
Further is also used in the sense of more, but farther is only used in the sense of physical distance.
Further vs. Farther
While addressing to soldiers he further said, "Enemy is 1 km farther from us".
Further vs. Farther
e.g. We have to move 1 km farther for further searching.
Further vs. Farther
e.g. We have to move farther without further delay.
Further vs. Farther
e.g. For small physical distance we use farther, and for imaginable distance we use further.
Furtherverb
(transitive) To encourage growth.
Further the economy.Fartheradjective
. Of or pertaining to being distant, or of greater distance in degree or of extension in time.
Furtherverb
To support progress or growth of something.
Fartheradjective
more distant in especially space or time;
they live in the farther houseFurtheradjective
; of or pertaining to being distant, or of greater distance in degree or of extension in time.
Fartheradjective
more distant in especially degree;
nothing could be further from the truthfurther from our expectationsfarther from the truthfarther from our expectationsFurtheradjective
More, additional.
Fartheradverb
to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense);
further complicated by uncertainty about the futurelet's not discuss it furthernothing could be further from the truththey are further along in their research than we expectedthe application of the law was extended fartherhe is going no farther in his studiesFurtheradverb
(conjunctive) Also; in addition to.
Fartheradverb
to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense);
farther northmoved farther awayfarther down the corridorthe practice may go back still farther to the Druidswent only three miles furtherfurther in the futureFurtheradverb
(location) At greater distance in space or time; farther.
Washington DC is further from Europe than New York.Furtheradverb
(conjunctive) Moreover; beyond what is already stated.
Further, affiant sayeth naught. (A formal statement ending a deposition or affidavit, immediately preceding the affiant's signature.)Furtheradverb
In continuation of what has already been enacted
Furtherverb
promote the growth of;
Foster our children's well-being and educationFurtherverb
contribute to the progress or growth of;
I am promoting the use of computers in the classroomFurtheradjective
existing or coming by way of addition;
an additional problemfurther informationthere will be further delaystook more timeFurtheradjective
more distant in especially degree;
nothing could be further from the truthfurther from our expectationsfarther from the truthfarther from our expectationsFurtheradverb
to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense);
further complicated by uncertainty about the futurelet's not discuss it furthernothing could be further from the truththey are further along in their research than we expectedthe application of the law was extended fartherhe is going no farther in his studiesFurtheradverb
in addition or furthermore;
if we further supposestated further that he would not cooperate with themthey are definitely coming; further, they should be here alreadyFurtheradverb
to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense);
farther northmoved farther awayfarther down the corridorthe practice may go back still farther to the Druidswent only three miles furtherfurther in the futureWhat is Further?
Further is the non-physical distance or for figurative distance. Further is a diverse word covering lot of ideas i.e. distance or days, galaxies, stars and also the imagination of poets. If a say the sun is far away from here, I would use the “further” for this distance. Further also covers the idea for furthermore, something more, extra or additional. When are talking, we often use furthermore in the sense of more.
What is Farther?
Farther is used for the physical distance between two things. It is a restricted term, only used for a measurable and physical distance. You can say the New York is 500 km farther from here. It is the physical distance. We can say the army troops are running with 2m farther from each other.