I wanted to place a tag equivalent to "moral philosophy" on my question, but there was none. I used "practical-ethics", but I do not feel ethics is the same as moral philosophy. Though it is similar, I do not feel moral philosophy can be crammed or reduced into ethics.
I'm not sold on the difference you outline in the comments, it seems like you're begging to find the tiniest difference when none really exists in common usage. And even if there is in fact some notable difference between the two, I feel like it would be too minor to warrant the use of a separate tag. The point of the tag system is to organize questions into categories and make questions of the same topic easier to find. But I feel like a tag of "morality" in the way you describe would have an esoteric meaning and most people would be using the term in the "normal" way, yet when they clicked on your tag they'ed be taken to questions only of this very specific idea you outlined, probably not what they really want.
I am for changing the tag synonyms, however. Right now we have "morality" as a tag synonym with ethics, so if anyone uses the term "morality" it is automatically changed to "ethics". Since there is some portion of people who see morality as the overarching concept and ethics as just a portion of it, we should probably make "ethics" the tag synonym with "morality".
That said, this is just my opinion, I do not make the rules here, the community does in accordance with principles outlined by the admins. If a lot of people agree with your change we can make it so. Hopefully we can get a few other people to chime in on the discussion. :)