How many different types of Eav Entity Types are available in Magento 2?

There are many Eav entity types are available with Magento 2 native.
Check list of Eav Entity Types for Inbuilt out of the box comes with Magento 2,
You can check list of Eav Entity Type from eav_entity_type database table.

All of the above Eav Entity Types are available with Magento 2.