In obsolete|lang=en terms the difference between thief and invest
is that thief is (obsolete) a waster in the snuff of a candle while invest is (obsolete) to put on (clothing).
As nouns the difference between thief and invest
is that thief is one who has carried out a theft while invest is (meteorology) an unnamed tropical weather pattern "to investigate" for development into a significant (named) system
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