“Farther” and “further” refer to distance. “Further” can also be “additional.”
Either “farther” or “further” is acceptable to refer to distance.
Merriam-Webster explains that, as adverbs, the two are interchangeable when referring to some notion of distance.
“Farther” seems to be limited to distance, as in “far.”
“Further” is more generic, taking on the sense of “additional.”
- as an adverb, may involve a relationship to a place or time
- as an adjective, may refer to something beyond
- as a verb, means moving an intangible something forward
“Furthermore” is a synonym for “moreover,” “in addition,” or “besides.”
Examples:
“Farther/further” as distance:
- My Nissan Versa travels farther/further on a tank of gas than Jackson’s Cadillac SUV, even though his tank holds more.
- (physical distance, either word)
- Shawna can swim farther/further underwater holding her breath than Victoria.
- (physical distance, either word)
“Further” as adverb:
- Miguel advanced further in his studies than any other member of his family, earning his Ph.D.
- (“further” = adverb modifying “advanced”)
- He wishes to investigate further into studies of the mind.
- (“further” = adverb modifying “investigate”)
- Furthermore, he plans to share his results with the world.
- (“Furthermore” = “moreover”)
“Further as adjective”
- His further studies using MRI technology should improve our understanding.
- (“further” = adjective modifying “studies”, continuing his studies)
- In the meantime, he has no further details to share.
- (“further” = adjective modifying “details”, no more details)
- Nor will he give further press conferences.
- (“further” = adjective modifying “press conferences”, no future press conferences)
“Further” as verb:
- What will you do to further your education?
- (“further” = verb, to continue your education)
- Using social media can further your opportunities as a writer.
- (“further” = verb, to improve your opportunities)
- Knowing proper grammar will further your chances to find an agent.
- (“further” = verb, to increase your chances)
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