Are Nidoviruses different from Serpentoviruses?

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For most hobbyists the terms are interchangeable, but the term "serpentovirus" is considered more scientifically accurate. The term "nidovirus" refers to the viral order- Nidovirales. This is a HUGE order of viruses containing many types of viruses. For example, coronaviruses are a human nidovirus. It's like referring to a ball python as an "reptile." There are more specific terms you can use like "snake" or "python" that are more helpful. When serpentoviruses were first discovered, the were described in the most broad sense possible- as a novel nidovirus. That group of novel nidoviruses has now been given a name as a new viral subfamily- Serpentovirinae. As such, "serpentovirus" is the more appropriate name for these viruses.