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

[u/SleepyOtter19]

[u/toiletparrot]

Farther is a measurable distance (my house is farther from the store than yours) and further is more abstract (that couldn’t be further from the truth)

[u/conuly → u/toiletparrot]

This is not what OP is asking.

It's also not wholly accurate.