請問goodness同good有咩分別?

good ( adjective) good+ ness = goodness( NOUN)
bad ( adjective) bad+ness = badness ( NOUN)
點解要加"ness"?
To make adjectives become nouns.
Examples:
His singing is good. ( Adjective) Correct!
His singing is goodness( noun). Wrong!
I admire the goodness (noun) of his heart. Correct!
I admire the good ( adjective) of his heart. Wrong!
the XXX<--- noun of something <-----------------------
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Goodness=noun
Oh my goodness! 表示驚訝 = 天呀!
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Badness ( noun) --------------- bad(adjective) +ness
the badness of her dress <---------- badness( noun) Correct!
the bad of her dress<----------------------bad( adjective) Wrong!_________________________________________
另外,請問danger同dangerous有咩分別?

danger = noun dangerous = adjective
He is in danger( noun). Correct!
He is in dangerous ( adjective). Wrong!
in + noun<--------------------------
He is facing the danger. danger ( noun) Correct!
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That game is dangerous ( adjective). Correct!
" dangerous" = adjective is used to describe 形容 " that game"( subject)
That game is danger ( noun). Wrong!
That game is ( adjective here) <--------------------
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That's it for now.
886

good is meaning好,
goodness is 'Oh!My goodness!'=My sky!
goodness=天啊!

danger is a noun(n)
dangerous is a adjective(adj)