The difference between For the most part and On the whole
For the most part is also adverb with the meaning: mostly.
On the whole is also phrase with the meaning: for the most part.
check bellow for the other definitions of For the most part and On the whole
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For the most part as an adverb (idiomatic):
Mostly; in general; usually
Examples:
"She talked about her kids, for the most part."