boost vs encourage

boost is a noun but encourage is not a noun.

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

As verbs, boost and encourage are synonyms defined as:

Other synonyms of boost include advance, further, promote.

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

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