Answer the following Homonyms which of these expresses distance?

The word that expresses distance is a) Farther. Farther specifically refers to physical distance — how much farther something is in terms of space. Further can also mean distance, but is often used for figurative or abstract extension (like further discussion). So, farther is the best choice when discussing actual, measurable distance. Father is a completely different word, meaning a male parent. Ferther is not a valid English word.