The difference between Come what may and No matter what
When used as adverbs, come what may means in spite of anything that might happen, whereas no matter what means definitely, under all and any circumstances.
No matter what is also pronoun with the meaning: whatever.
check bellow for the other definitions of Come what may and No matter what
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Come what may as an adverb (idiomatic):
In spite of anything that might happen; whatever may occur.
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No matter what as a pronoun:
Whatever; used to indicate that the speaker would do the same thing regardless of the options.
Examples:
"No matter what they might do, I'll look after you."
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No matter what as an adverb:
Definitely, under all and any circumstances.
Examples:
"I'll love you no matter what — even if you hurt me."