further vs foster

further and foster both are adjectives.

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

As verbs, foster is a hyponym of further; that is, foster is a word with a more specific, narrower meaning than further:

Other hyponyms of further include connive at, wink at, cultivate, further, spur, help, carry, feed, conduce, contribute, lead.

As verbs, further and foster are synonyms defined as:

Other synonyms of further include cultivate.

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

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

further (adverb)	foster (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