What is comparative and superlative for the word inventive?

Most of the time, when you find the comparative and superlative version of a Word, you add the suffixes '-er' and '-est'. In this case, though, you cannot put 'creativer' or 'creativest'. Instead, you add 'more' and 'most' in front of the Word, so the comparative version becomes 'more creative', and the superlative form becomes 'most creative'.