Final answer:
The word 'sweeter' is the comparative form of the adjective 'sweet'.
Step-by-step explanation:
The word 'sweeter' is the comparative form of the adjective 'sweet'. Comparative adjectives are used to compare two things. They are formed by adding '-er' to the base form of the adjective. For example, in the sentence 'This apple is sweeter than that apple', 'sweeter' is the comparative form.
Learn more about Comparative adjectives