I have already learned what is the general difference between conjunctions and conjuncting pronouns, and that is the fact that a pronoun can be a subject or an object in the clause whereas a conjunction can not. But it seems, there are still exceptions like "whoever" and "whatever".
So, in the sentence below "whatever" is certainly a pronoun. Here, the dependent clause is a noun clause.
You are free to do whatever you want.
But in the next sentence, which contains adverbial clause, "whatever" seems to be a conjunction (because like any subordinating conjunction, it shows the relationship between clauses).
I won`t leave her whatever happens.
This I more or less understood although I can`t quite get why Macmillan dictionary says that "whatever "can be both pronoun and conjunction while Lexico (Oxford) says that it can only be a pronoun...
But the real trouble is from now on! In the sentence
Whatever decision he made I would support it.
"whatever" seems to function like a conjunction, but it`s placed before the noun just like a determiner. So, what is it here: determiner or conjunction? Or maybe even pronoun?
I don`t get it! Please, help me.