It isn't actually that simple, though. There are a lot of people (largely Democrats) who oppose abortion personally but believe in a woman's right to choose. In other words, they would never have an abortion and they would never counsel anyone to have an abortion because they are personally opposed to it but they don't feel that they should enforce their beliefs on others. These people can in no way be called "pro-abortion."
And calling even people who would consider abortion "pro-abortion" is fairly insulting, like they're all for killing fetuses--pro-choice people call themselves pro "choice" because they realize that sometimes people end up in shitty situations and have to make difficult decisions and they should have a choice in that circumstance. Acting like because someone understands why a 15 year old in a poor family might not consider that a good situation to have a child, that person is gung-ho about abortions doesn't make sense. I doubt there's really much of anyone who's "pro-abortion." A lot of people are pro-"Life creates a lot of very difficult choices around pregnancy and the government shouldn't make those choices."
Or, "pro-choice" for short.