Compound Relative Pronoun
Let's check....
whoever = anyone who whomever = anyone whom
whosever = anyone whose whichever = anything that
whatever = anything that
Whoever says so is a liar.
Anyone who says so is a liar.
Whoever may say so, it's a lie.
No matter who may say so , it's a lie.
I'll follow you wherever you go.
I'll follow you no matter where you go.
Eat whatever food you like.
Eat any food that you like.
~ever = no matter~
whoever = no matter who
whomever = no matter whom
whosever = no matter whose
whichever = no matter which
whatever = no matter what
I don't believe what you say.
I don't believe whatever you say.
I don't believe whatsoever you say.
What you may say, I won't believe.
Whatever you say, I won't believe.
Whoever comes first may take it.
Anyone who comes first may take it.
No matter who comes first may take it.
You can do whatever you want.
You can do anything that you want.
You can do no matter what you want.
Compound Relative Pronoun