Human: What is the difference between a'synonym' and an 'antonym'? Assistant: 
The main difference between a synonym and an antonym is that a synonym is a word or phrase that has the same meaning as another word or phrase, while an antonym is a word or phrase that has opposite or contrasting meanings. For example, "dog" is a synonym for "canine", since they both mean the same thing. However, "cat" is an antonym of "canine", since it means something completely different.