267570 Ad Changer

I am looking for a simple software to change text or replace text with synonyms. In other words, I am looking for a software where I can enter my ad and hit a button and automatically generates similar ads changing some of the words with synonyms. The reason I am looking for this is to generate different AD's so when I post them they look unique. The ideal would be to have the software create automatically 100 to 300 different similar ads at a time. I will need my whole team to use this software or tool as well and giving them a means to create a username and password that I admin will be able to cancel due to abuse of software.