different between underextension vs overextension

English

under- +? extension

underextension (countable and uncountable, plural underextensions)

(linguistics) Application of a term to too few referents, as for example when a child uses cat to refer only to the family pet.

over- +? extension

overextension (countable and uncountable, plural overextensions)

The state or quality of being overextended; extension beyond normal, correct, or appropriate bounds or limits.
(linguistics) Application of a term to too many referents, as for example when a child uses cat to refer to all animals.

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