Here are some other related terms:
* Kabaligtaran - This term is also commonly used for antonym.
* Kontradiksyon - This term refers to a contradiction, which can also be considered an antonym.
* Magkasalungat - This term literally means "opposite" and is a more general term that can be used to describe anything that is the opposite of something else.
You can use any of these terms depending on the context.