Word acting as a modifier for verb in a Punjabi sentence is termed as adverb. Adverbs can indicate manner, time, place, cause etc. Unlike adjectives, adverbs can virtually be used at any place in Punjabi sentences, though not in nominal phrases.
For example, ਉੱਪਰ uppar ‘upon’, ਉੱਤੇ uttē ‘over’, ਹੇਠਾਂ hēṭhāṃ ‘below’, ਕਦੇ kadē ‘sometime’, ਅੱਜ ajj ‘today’, ਕਿਧਰੇ kidharē ‘somewhere’ are some Punjabi adverbs.
Some Punjabi grammar authors state that the adverbs are those that can modify adjectives as well (probably under the influence of the English language definition of adverb). But, most authors rightly define a Punjabi adverb as the one that modifies verb only, and not adjectives.