foster vs further

foster and further both are adjectives.

Word	Noun	Adjective	Verb	Adverb
foster	No	Yes	Yes	No
further	No	Yes	Yes	Yes

As verbs, foster and further are synonyms defined as:

Other synonyms of foster include cultivate.

As verbs, further is a hypernym of foster; that is, further is a word with a broader meaning than foster:

Other hypernyms of foster include advance, boost, encourage, promote.

foster (adjective)	further (adjective)
providing or receiving nurture or parental care though not related by blood or legal ties	more distant in especially degree

foster (verb)	further (verb)
help develop, help grow	contribute to the progress or growth of
promote the growth of	promote the growth of
bring up under fosterage; of children

foster (adverb)	further (adverb)
	to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense)
	to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense)
	in addition or furthermore