A few chromebook questions from a silver surfer...

Hello out there... Salutations.
1)What are the most fundamental differences between an Android tablet and a chromebook?
2)What is the correct name for a chromebook that can be used as a tablet?
Convertible, 2in1, combination, 360?
3)Are they all touchscreen?
4) What percentage of Playstore apps are available to download and is this to increase?

Any help in clarification would be greatly appreciated...

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