The difference between For the most part and Primarily
When used as adverbs, for the most part means mostly, whereas primarily means of a primary or central nature, first and foremost.
check bellow for the other definitions of For the most part and Primarily
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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."
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Primarily as an adverb (focus):
Of a primary or central nature, first and foremost