The term 'suffix with capital' refers to three different suffixes that can be added to words to create new words. The first is 'ize, ' which is a suffix that is used to indicate the action of making something into a certain form or state. The second is 'ISM, ' which is a suffix that is used to indicate a belief, system, or practice. The third is 'ist, ' which is a suffix that is used to indicate a person who practices or believes in a certain system or ideology. All three of these suffixes are typically written with a capital letter at the beginning.