raise vs better

raise and better both are nouns.

Word	Noun	Adjective	Verb	Adverb
raise	Yes	No	Yes	No
better	Yes	Yes	Yes	Yes

As verbs, better is a hypernym of raise; that is, better is a word with a broader meaning than raise:

Other hypernyms of raise include ameliorate, amend, improve, meliorate.

raise (noun)	better (noun)
the act of raising something	something superior in quality or condition or effect
increasing the size of a bet (as in poker)	the superior one of two alternatives
the amount a salary is increased	someone who bets
an upward slope or grade (as in a road)	a superior person having claim to precedence

raise (adjective)	better (adjective)
	(comparative of `good') superior to another (of the same class or set or kind) in excellence or quality or desirability or suitability; more highly skilled than another
	(comparative of `good') changed for the better in health or fitness
	(comparative and superlative of `well') wiser or more advantageous and hence advisable
	more than half

raise (verb)	better (verb)
cause to become alive again	get better
increase the level of	to make better
raise the level or amount of something	surpass in excellence
raise in rank or condition
invigorate or heighten
put an end to
bring (a surface or a design) into relief and cause to project
multiply (a number) by itself a specified number of times: 8 is 2 raised to the power 3
cause to be heard or known; express or utter
put forward for consideration or discussion
activate or stir up
establish radio communications with
pronounce (vowels) by bringing the tongue closer to the roof of the mouth
cause to assemble or enlist in military
bet more than the previous player
bid (one's partner's suit) at a higher level
summon into action or bring into existence, often as if by magic
construct, build, or erect
cultivate by growing, often involving improvements by means of agricultural techniques
create a disturbance, especially by making a great noise
call forth (emotions, feelings, and responses)
raise from a lower to a higher position
cause to puff up with a leaven
move upwards
collect funds for a specific purpose
look after a child until it is an adult
give a promotion to or assign to a higher position
register formally as a participant or member

raise (adverb)	better (adverb)
	comparative of `well'; in a better or more excellent manner or more advantageously or attractively or to a greater degree etc.
	from a position of superiority or authority