Verbs

(v)foster, further, cultivatepromote the growth of“Foster our children's well-being and education”
(v)promote, advance, boost, further, encouragecontribute to the progress or growth of“I am promoting the use of computers in the classroom”

Adjectives

(s)further, farthermore distant in especially degree“nothing could be further from the truth”, “further from our expectations”, “farther from the truth”, “farther from our expectations”

Adverbs

(r)further, fartherto or at a greater extent or degree or a more advanced stage (‘further’ is used more often than ‘farther’ in this abstract sense)“further complicated by uncertainty about the future”, “let's not discuss it further”, “nothing could be further from the truth”, “they are further along in their research than we expected”, “the application of the law was extended farther”, “he is going no farther in his studies”
(r)furtherin addition or furthermore“if we further suppose”, “stated further that he would not cooperate with them”, “they are definitely coming; further, they should be here already”
(r)farther, furtherto or at a greater distance in time or space (‘farther’ is used more frequently than ‘further’ in this physical sense)“farther north”, “moved farther away”, “farther down the corridor”, “the practice may go back still farther to the Druids”, “went only three miles further”, “further in the future”