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So solid-state effectively means semiconductor based, but also not based on things that aren't semiconductors, depending on context...

Solid-state drives do indeed not contain non-solid-state critical parts, but solid-state transformers do.

Yes, a solid-state motor starter uses semiconductors (thyristors) to switch the line voltage power instead of using (an) electromagnetic contactor(s): https://www.eaton.com/content/dam/eaton/products/industrialc...