However, you could consider these options depending on the context:
General contrast:
* Crocodile: While both are crocodilians, they have distinct characteristics and habitats.
* Other animals: Depending on the context, you might use "mammal," "bird," "fish," or other animal categories.
Specific characteristics:
* Friendly: If you're contrasting the alligator's reputation for aggression, you could use "gentle," "harmless," or "peaceful."
* Aquatic: If you're emphasizing the alligator's aquatic nature, you might use "terrestrial" or "land-based" animals.
Figurative language:
* Gentle giant: This could be used if you're contrasting the alligator's size with its perceived temperament.
Ultimately, the best "antonym" for alligator depends on the specific context and what you are trying to contrast.