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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
I've seen "Domain Controller" and "Subscriber" for the sake of plausible deniability.
In the case of SPI, they want to keep intact the names MISO (master in, slave out) and MOSI. So they use things like "Main" and "Sub".