Answer:
They are not antonyms at all
Explanation:
Antonyms are two words that have an opposite meaning, like deep and shallow. In this case they are not. Big is an adjective and Bigger is the comparative degree that follows the German Comparison (Klein, Kleiner) for words with one syllable.
Answer: not antonyms at all
Explanation:
Big and bigger are words that belong to the same category, the only difference is that the second one is modified with the suffix -er to form a comparative form of the same adjective.
It would be possible to say that they are antonyms if one described a quality and the other one the opposite, but that is not the case of these words.
