The word "quickly" in the given sentence is an adverb.
To identify the part of speech for the word "quickly" in the sentence "She ran quickly to catch the bus," we can analyze its function and meaning in the sentence. In this case, "quickly" describes how the action of running was performed, offering more information about the verb "ran." This tells us that "quickly" is an adverb in this sentence. Adverbs modify verbs, adjectives, or other adverbs, providing information about time, manner, place, frequency, degree, or cause. In this case, "quickly" is describing the manner in which the action of running is being carried out.
