further

(Old English: (first meaning), more forward; (current meaning), in addition, to a grater degree)

further
furtherance (s) (noun), furtherances (pl)
The act of helping forward: After Lynn's mother died, she inherited a lot of money which was an excellent furtherance in paying off her debts due to buying her condo.
furtherer (s) (noun), furtherers (pl)
An individual who help in fulfilling an aim: Jenny was very musical and wanted to play the piano, so her mother, as a furtherer, bought one for her so she could take lessons and perhaps become a very good pianist!
furtherest (adjective), further; furtherer; furtherest
Informel, non-standard, furthest; relating to something that is the most faraway place or thing: The elderly Mrs. Smith gold her grandson that the shop was the furtherest one from her home and that he should take his car and not walk, which would take a very long time.
furthermore (adverb) (not comparable)
Relating to, or an indication of how much more information is to be presented: Furthermore is a useful word when anyone has another point to make in an argument or an explanation. The word furthermore is often used at the beginning of a sentence and it is usually followed by a comma.

Mac skillfully took charge of the going away party for his friend, furthermore, he even stayed afterwards to clean up everything.

furthermost (adjective) (not comparable)
Pertaining to a place, in comparison to others, that is the most remote or that is most distant: The newlywed couple walked along the seashore until they reached the furthermost spot where they could be by themselves and watch the sun set.