Comparative adverbs use "more" to compare two actions using an adverb ending in "-ly", while superlative adverbs use "most" to compare three or more actions. For example, "She ran more gracefully than me" uses a comparative adverb, while "The lion roars most eagerly in the jungles" uses a superlative adverb. We add "more" and "most" to adverbs with two or more syllables.

2. Meaning
A Comparative Adverb is when you compare two actions by using the
word more before an adverb ending in –ly.
A superlative Adverb is when you compare with three or more actions by
using the word most.
For example: The lion roars most eagerly in the
jungles.
For example: She ran more gracefully than me.

3. Note
We add more and most to
an adverb when the adverb
has 2 or more syllables.

4. Thank you