More rivalrous refers to a situation where resources are scarce and competition becomes tougher amongst individuals or groups. Synonyms for more rivalrous may include words like competitive, cut-throat, contentious, aggressive, combative, and confrontational. These words accurately describe the intense struggle for limited resources that often takes place in business or sports. On the other hand, words like cooperative, collaborative, harmonious, and innovative can be used to describe situations where individuals or groups work together towards a common goal, effectively reducing the level of rivalry. The use of synonyms adds depth and clarity to any writing, enabling readers to fully understand the intended meaning of the text.