IF they are synonims as Zora says...
Are there sentences right?
"I don�t like cats AT ALL".
"I don�t like cats WHATSOEVER".
"In my class there will be no bad behavior whatsoever"
"In my class there will be no bad behavior at all" .
"There is no reason whatsoever to keep acting like this"
" There is not reason at all to keep acting like this".
"He didn�t like the game at all" .
"He didn�t like the game whatsoever".
"When I was younger I didn�t have much money at all" .
"When I was younger I didn�t have much money whatsoever".