Previously, when discussion abortion, I've always used the terms "pro-life" and "pro-choice" -- being fair, I figured, by given each crowd the label it wanted.

This comment by Keith Burgess-Jackson, however, raises an excellent counterargument:

Don't tell me that I'm using the wrong label. Yes, pro-abortionists call themselves "pro-choice," but this obscures the issue. They're pro-choice on abortion. They're in favor of abortion. They want abortion to be freely available, both legally and financially. Suppose I think people should be free, legally speaking, to commit homicide. Wouldn't it be absurd to call me, or for me to call myself, "pro-choice"?

Indeed. So perhaps my labels should be "pro-abortion" and "anti-abortion". After all, some of the "pro-life" crowd approve of taking life in a number of circumstances (such as war or capital punishment), so we can't similarly say each of them are always motivated by a desire to save human life no matter what.

A good rejoinder to my last comment might be to argue that principled support for both war and capital punishment are rooted in the desire to ultimately save the maximum number of lives possible.

Possibly, but it isn't clear that each and every "pro-life" person who supports war and/or capital punishment does so for the express reason of increasing total human life expectancy. But it is clear each "pro-life" person opposes abortion.