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A verb form that is used as an adjective is indeed a participle. Participles can be present or past and they modify nouns, providing additional information about them. For example, in the phrase "the running water," "running" is the present participle of the verb "to run," and it describes the noun "water." Similarly, in "the broken window," "broken" is the past participle of "to break," modifying "window."

The other options represent different grammatical forms. A gerund is a verb form that ends in "-ing" and functions as a noun, such as in "Swimming is fun." An infinitive consists of "to" followed by the base form of a verb, like "to run," and can function as a noun, adjective, or adverb, but it does not inherently act as an adjective. A noun, on the other hand, refers specifically to a person, place, thing, or idea and does not describe objects like adjectives do. Thus, the participle is the correct choice for a verb form used as an adjective.