encourage vs boost

encourage is not a noun while boost is a noun.

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

As verbs, encourage and boost are synonyms defined as:

Other synonyms of encourage include advance, further, promote.

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

encourage (verb)	boost (verb)
spur on	increase or raise
inspire with confidence; give hope or courage to	give a boost to; be beneficial to
contribute to the progress or growth of	push or shove upward, as if from below or behind
	increase
	contribute to the progress or growth of