Pack Version:
dev-5573535

Description:
The phrase Micro Miner is spelt as "Micro Miner" in 5 items, and as "Microminer" in 8 items.

Expected Behavior:
The spellings should be consistent

Steps To Reproduce:
Search in the JEI for "Microminer" and "Micro Miner"

Crash Log:
N/A

Screenshots:
Microminer:

Micro Miner:

You are right that we've been using them interchangeably. Based on the 1.0 release notes infographic, I believe they are canonically "Microminers" but even Damien has used both terms in Discord. I'm partial to "Micro Miners" personally.