alt Hacker News"Car" is a good example of a label that's pretty strictly agreed to. If someone tells me they've developed a new car and then shows me a motorcycle, it's easy to prove that it's not a car, even though many of its engineering principles and functional components are identical to those in cars.
With consciousness, on the other hand, there doesn't seem to be any motorcycle-equivalent. Essentially everyone I've discussed the issue with (myself included) expects that any mind which runs on similar principles to ours or has similar thoughts to our thoughts is conscious.
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You really don't have much experience in philosophy of language do you? It's notoriously hard to pin down the edges of such terms, even something like car or table.
Is a Reliant Robin a car or a tricycle? If it's a car, why aren't other tricycles? What about a side-car of a motorcycle? What about an APC? What's the distinction between a flying car and a plane?
In the US, we have redefined a lot of our "cars" to be "trucks" instead so they don't have to meet cafe standards.