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Answer:

ex-wife - A woman to whom someone was formerly married, from whom they are now divorced.
miscarry - Fail to attain an intended or expected outcome.
interisland - Operating between islands.
interschool - Occurring between schools.
overact - To act a role in an exaggerated manner.
underestimate - Estimate something to be smaller or less important than it actually is.
ex-soldier - A former soldier or veteran.
supermom - An exemplary or exceptional mother, especially the one who successfully manages a home and brings up children while also having a full-time job.
miscalculate - To calculate (an amount, distance, or measurement) wrongly.
overconfident - To be excessively or unreasonably confident.
underdeveloped - Not fully developed.
underground - Beneath the surface of the ground.

Explanation:

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