Question 8: What is an antonym of the word rival?

Read the following passage and answer the given subquestions.
Words are witnesses which often speak louder than documents. Let us consider a few English words which were invented, or gained their modern meanings, substantially in the period of sixty years with which this volume deals. They are such words as ‘industry’, ‘industrialist’, ‘factory’, ‘middle class’, ‘working class’, ‘capitalism’ and ‘socialism’. They include ‘aristocracy’ as well as ‘railway’, ‘liberal’ and ‘conservative’ as political terms, ‘nationality’, ‘scientist’ and ‘engineer’, ‘proletariat’ and (economic) ‘crisis’. ‘Utilitarian’ and ‘statistics’, ‘sociology’ and several other names of modern sciences, ‘journalism’ and ‘ideology’, are all coinages or adaptations of this period. So is ‘strike’ and ‘pauperism’.
To imagine the modern world without these words (i.e. without the things and concepts for which they provide names) is to measure the profundity of the revolution which broke out between 1789 and 1848, and forms the greatest transformation in human history since the remote times when men invented agriculture and metallurgy, writing, the city and the state. This revolution has transformed, and continues to transform, the entire world. But in considering it we must distinguish carefully between its long-range results, which cannot be confined to any social framework, political organisation, or distribution of international power and resources, and its early and decisive phase, which was closely tied to a specific social and international situation. The great revolution of 1789–1848 was the triumph not of ‘industry’ as such, but of capitalist industry; not of liberty and equality in general but of middle class or ‘bourgeois’ liberal society; not of ‘the modern economy’ or ‘the modern state’, but of the economies and states in a particular geographical region of the world (part of Europe and a few patches of North America), whose centre was the neighbouring and rival states of Great Britain and France. The transformation of 1789–1848 is essentially the twin upheaval which took place in those two countries, and was propagated thence across the entire world.
- Introduction, Age of Revolution 1789-1848, Eric Hobsbawm.

What is an antonym of the word rival?