Answer: The type of word that often ends in -ly is the adverb.
Step-by-step explanation: An adverb is a type of word that can be used to modify a verb, an adjective or another adverb. Moreover, there are different types of adverbs since they can express time, manner, location, degree and frequency. However, most adverbs are formed by adding the suffix "-ly" at the end of a word, generally at the end of an adjective. Some examples are "quickly", "silently" and "smoothly".