If something is inferior, can something be ferior?

Oh kitty, kitty, no. The 'in' part of inferior does not mean 'not' as it does in some words. The root is the Latin 'infra', meaning 'below'. This from the Online Etymology Dictionary:

'inferior (adj.) - early 15c., from L. inferior "lower," comp. form of inferus (adj.) "that is below or beneath," from infra "below." Noun meaning "a person inferior to another in rank, etc.," is from 1502. Inferiority complex first attested 1922.'

Just to complete the picture, though I'm sure you don't need to be told, the opposite of 'inferior' is 'superior' - or 'kittypal'!

LOL, the reason I asked is I heard someone use the word ferior, I then looked it up, of course I didn't find it. Thought maybe someone knew if it actually existed, thanks.