Arguing over words rather than the substance of the issue is missing the point.
The point is that humans are capable of knowing what is the good thing to do, in any situation, whether it be not possessing slaves or not killing the unborn child, BUT, humans will ignore what is the good when led astray by our passions, desire for pleasure, pursuit of excess, money, power, etc.
For example, when slavery was legal and financially beneficial then the many could deceive themselves to justify slavery. Take away the financial benefits and the many will agree that slavery is bad.
Abortion is the same. Now that it is legal and financially beneficial to terminate the unborn human’s life (i.e., not having to be responsible for the child) then people like you today can justify it. But in another age and time when there is no reward to killing ones unborn child (for reasons other than medical necessity) the many will recognize that it is evil, barbaric, and inhumane. I have no doubt that a future generation will condemn our own, just as we condemn those before us who justified slavery.