How many women have you met that lost their baby unintentionally, and called it an abortion instead of calling it a miscarriage? I haven't met a single one yet.
Miscarriage is commonly used if it was an unintentional loss, which the mother did not choose to have happen.
Abortion is commonly used if the mother chose to end the pregnancy.
You are just trying to play with semantics. Everyone in normal society understands the usage and its connotation of both words.