[HELP] I want to Create a program to check if two nouns mean the same

I want to be able to input two strings like "CBA" and "Commonwealth Bank" and be returned with a confidence level on if they mean the same noun. Some further examples are:

"St" and "Street"
"Amex" and "American Express"
"Nike pty ltd" and "Nike"
"coca-cola amitil" and "coca-cola"

If anyone can give me guidance on how i can achieve this with python and AI/Machine learning then i would be extremely grateful!!!!