Just create an alias of it and not purge it entirely!
WTH Python!!! Just create an alias of it and not purge it entirely! "Master" and "Slave" perfectly convey the concept. In the English language many words have different meanings based on their context. It's plainly obvious that no allusion to human slavery is meant in the context of software or hardware module relationships. I don't even think it is problematic. The real problem seems to be the people who are taking terms outside their intended space. Why are we linking a scar on human history to terminologies explaining technical relationships?
Then lets also ban 0 and 1 because it can offends non-binary people!