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From an information security aspect, is there a difference between saying "read-only" or "write-protected" storage/memory?

Is there a chance that a read-only memory would not be write-protected at the same time?

In addition, is the OTP (one-Time-Programmable) memories better described as write-protected memories or as Read-only memories?

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Read-only means one can only read from it. Write-protected means that writing is possible but controlled. Those controls can fail.

If "read-only" is defined in the hardware, then it will always be write-protected at the same time.

OTP memory is OTP. After being burned, it is read-only.

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