Hollo is a verb that means to shout or call out loudly. Some synonyms for this word are yell, scream, holler, whoop, cheer, shout, bellow, cry, and call. These words all imply a need to communicate something loudly or to get someone's attention in a forceful manner. Depending on the context, some of these synonyms may be more appropriate than others. For example, cheering would be more suitable for sports events, while screaming would be more appropriate for someone in distress. Having a variety of synonyms for hollo allows for more nuanced expression and precise communication.