re-
The prefix that fits the definition of backward or back is "re-".
The prefix that fits the definition of pseudoscience is "pseudo-", which means false or not genuine.
Para
The prefix "retro-" means "backward" or "behind." It is commonly used to show something is old-fashioned or based on previous styles or trends.
The prefix of the word retroperitoneum is "retro-," which means behind, backwards, or on the other side.
The prefix that fits the definition of backward or back is "re-".
The prefix that fits the definition of pseudoscience is "pseudo-", which means false or not genuine.
Backwards, or back in time.
Para
geo
para
auto
olig
ennea
pseudo
Para is the prefix best fitting the definition of beside.
You could add the prefix mis- to it to make the word misfits.