It's important to note that "-ize" isn't a stand-alone suffix. It's part of a larger suffix called -ize/-ise. This suffix is used to turn nouns or adjectives into verbs.
Here are some other examples:
* Real (adjective) + -ize = Realize (verb)
* Normal (adjective) + -ize = Normalize (verb)
* Visual (adjective) + -ize = Visualize (verb)