In obsolete|lang=en terms the difference between cost and invest
is that cost is (obsolete) a rib; a side while invest is (obsolete) to put on (clothing).
As nouns the difference between cost and invest
is that cost is manner; way; means; available course; contrivance or cost can be amount of money, time, etc that is required or used or cost can be (obsolete) a rib; a side while invest is (meteorology) an unnamed tropical weather pattern "to investigate" for development into a significant (named) system
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