The word ‘abortion’ means to end something (anything) prematurely, and is too vague a term to use with regard to pregnancy. Further, it is commonly used for three very different acts, each of which should have their own unique terms:

a) Miscarriage (often called spontaneous abortion).
b) Indirect abortion, when the child dies unintentionally as a result of a physician attempting to save the mother. Legitimate under the principle of double-effect.
c) Direct intentional killing of a preborn human being.

For clarity’s sake, it is very important to use accurate terminology. Especially where there is moral confusion. Regarding the three acts above:

With a), ‘miscarriage’ should suffice.
With b), ‘surgical procedure’ or ‘operation’ is more accurate.
With c), ‘prenatal homicide’ is most accurate.

Of the three, only c), prenatal homicide, is an ethical issue. To intentionally kill an innocent human being – under any circumstance and for any end – is objectively murder.