The term "great hundred" can be used to describe a large quantity of something. There are several synonyms that can be used in place of this phrase, including "century," "centenarian," and "one hundred." Additionally, words like "myriad" and "multitude" can be used to convey the idea of a vast number, while words like "bountiful" and "copious" can be used to describe an abundant or plentiful amount of something. If you want to emphasize the size of something, you could use words like "enormous," "immense," or "prodigious." Ultimately, there are many ways to convey the idea of a large quantity without resorting to the phrase "great hundred".