A suffix is an element of a language that is added to the end of a word. E.g. -ly is a suffix often found at the end of adverbs: really, quickly, happily, strangely, etc., -d/-ed is a suffix often found at the end of a verb to denote the simple past: used, bruised, grazed, heated, etc.
Recently Prince Charles used the word 'Hitlery,' in the sense of "possessing some properties of Hitler." Is there any difference between the suffixes -ish and -y ?