How do I teach Siri to correctly type a word I say using voice to text?

Using voice to text, I am trying to get Siri to type words that it is having difficulty with. I have a friend who has a very unusual spelling to her name and I can't get Siri to type it correctly.

I also have trouble with Siri not correctly spelling other words I say. For example: I belong to Fire Corps. Whenever I say "corps" Siri types anything but corps. (For example, I say corps it types corn, core, cooler, Coors, course, corpse) How can I program Siri to recognize the words that I am saying?

I have a disability with my hands so voice to text is really important. Any help is greatly appreciated!