Internet English Resources - Grammarly.com 3

However, in American English the noun and the verb are "practice"

Farther vs. Further:

This one is actually sort of a trick question. In the U.S., farther is usually used to indicate actual, physical distance, while further is more of a metaphorical, intangible distance. For example, “We’re farther from Austin than San Antonio” but “Her statement couldn’t have been further from the truth.” However, in U.K. English, further is used for both meanings, and, according to Grammarist, farther is rarely used. Even in U.S. English, however, many dictionaries and style guides either make no distinction between the terms or recommend that further be used across the board