What is the suffix of "invitation" and "information" ?
Is it "tion" or "ation"?

Question

Answer

Suffix of information is -tion

Answer

I think the answer to your question is subjective. I would say it is "ation" since that is what is added to the roots "invite" and "inform", but I would not argue with anyone who said "tion".

Answer

invite -- invitation
inform -- information
prepare -- preparation
register -- registration
admire -- admiration

I'd say it's suffix "-(a)tion"