good vs welfare

good and welfare both are nouns.

Word	Noun	Adjective	Verb	Adverb
good	Yes	Yes	No	Yes
welfare	Yes	No	No	No

As nouns, welfare is a hyponym of good; that is, welfare is a word with a more specific, narrower meaning than good:

good (noun)	welfare (noun)
a raw material that is sold in large quantities, usually to other businesses for manufacturing or production purposes	governmental provision of economic assistance to persons in need
benefit	something that aids or promotes well-being
moral excellence or admirableness	a contented state of being happy and healthy and prosperous
that which is pleasing or valuable or useful

good (adjective)	welfare (adjective)
having desirable or positive qualities especially those suitable for a thing specified
morally admirable
promoting or enhancing well-being
having the normally expected amount
with or in a close or intimate relationship
thorough
generally admired
resulting favorably
not left to spoil
not forged
tending to promote physical well-being; beneficial to health
in excellent physical condition
appealing to the mind
agreeable or pleasing
exerting force or influence
most suitable or right for a particular purpose
capable of pleasing
deserving of esteem and respect
of moral excellence
having or showing knowledge and skill and aptitude
financially safe

good (adverb)	welfare (adverb)
(often used as a combining form) in a good or proper or satisfactory manner or to a high standard (`good' is a nonstandard dialectal variant for `well')
completely and absolutely (`good' is sometimes used informally for `thoroughly')