Yes; if the "ly" ending didn't give it away, it's used to modify adjectives: considerably larger, considerably cheaper, etc.

Glasses vary very considerably in size.

Glasses vary very considerably in size.

Glasses vary very considerably in size.

Glasses vary very considerably in size.

We are considerably older than our children.

The thymus is the organ that regresses considerably with age.

Consideration is the noun.

Considerable is the verb.

Considerably is the adverb.