Which part of speech is the word scornfully in phrase after bumping a crest?

The word "scornfully" in the phrase "after bumping a crest" is an adverb.

Here's why:

* Adverbs modify verbs, adjectives, or other adverbs. They tell us how, when, where, or to what extent something happens.

* In this case, "scornfully" modifies the verb "bumping". It tells us *how* the bumping was done - with scorn.

Let me know if you have any other words you'd like to analyze!