Einlanzer0
Adventurer
By "clostered cleric" do you mean something like a stay-at-home temple cleric? If not, please elaborate.
What would distinguish a Witch from a Shaman; and what would distinguish either or both from either Sorcerer or Druid/Nature Cleric?
And by "Scholar/Expert" are you thinking of some sort of Mage/Rogue hybrid, or are you instead thinking of a (perhaps non-adventuring) sage-like class?
And for those of us who don't DMGuild, in short form what makes the Emergent tick?
For your question on the cloistered cleric, yes.
A shaman is a primal medium and a spirit user, which is very different from a druid. A witch is a mystic fortune teller or any number of other things.
The simple truth is there are tons of ways you can differentiate classes. The ways that the official classes are distinguished are arbitrary. What distinguishes a paladin from the fighter? Only what WotC says it does.