在以下几组单词中，将不是近义词的单词找出来: 1. happy, joyful, glad, sad 2. cat, feline, dog, canine


1. happy, joyful, glad, sad
2. cat, feline, dog, canine
1. sad (it is the only antonym, or opposite, of the other three words which are synonyms)
2. dog (it is not a synonym of the other three words which all refer to different types of cats)