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somewhat depends on context what the best replacement is.

Primary/Replica is often used in databases.

Distributed databases where by nature that often can change had already often adopted the terminology used by consensus algorithms, which typically speak of a "leader" (that's choosen out of "nodes", "members", "servers" by "leader election" of some kind. Sometimes "follower" for the non-leader nodes)

Primary/Secondary is an option.

In electronics there is the suggestion of Controller/Peripheral




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