boost vs further

boost is a noun but further is not a noun.

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

As verbs, boost and further are synonyms defined as:

Other synonyms of boost include advance, encourage, promote.

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

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

boost (noun)	further (noun)
the act of giving hope or support to someone
the act of giving a push
an increase in cost

boost (adjective)	further (adjective)
	more distant in especially degree

boost (verb)	further (verb)
increase or raise	contribute to the progress or growth of
give a boost to; be beneficial to	promote the growth of
push or shove upward, as if from below or behind
increase
contribute to the progress or growth of

boost (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