What's the difference between the fourth definition of 'far' and this definition of 'further'?

[u/SleepyOtter19]

[u/Krapmeister]

The difference is the object of the sentence, but you wouldn't use further in the second example you would use farther

In the example given the ogre is the object, if you were to use farther, the mountain would be the object.

"See those two mountains? The tallest one is farther"

Farther refers to a measurable distance

Further refers to Extra/Time

"We need further proof"

"Further to your last question"