Miniscule is an adjective meaning very small. Morsel is a noun referring to a small amount or a tasty treat. While there are some examples where the words miniscule and morsel could be interchanged, they are not the same.
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tiny,miniscule,mini,meager,little
A little of something, a morsel, etc.
Morsel
little
The opposite would be scant, or miniscule, or limited.