Graminivore is a word that refers to an animal that mainly feeds on grass and other herbaceous plants. Synonyms for this word can vary depending on the context. Some common synonyms include herbivore, which refers to animals that mainly consume plant matter. Other synonyms include grazers and browsers, which specifically refer to animals that feed on grass and leaves respectively. Additionally, the term folivore can be used to describe animals that primarily eat leaves. Some other synonyms for graminivore include cellulose digesters, ruminants, and bulk feeders. Each of these terms is used to describe the eating habits of animals that mainly consume plant matter.