Africa's largest country is Algeria, which spans over 2.3 million square kilometers. However, there are several other synonyms for the phrase "Africa's largest country." One alternative is "the largest country in Africa," which is essentially the same phrase with the words rearranged. Alternatively, one could say "the biggest African nation," which conveys the same idea but uses different phrasing. Another option is to say "the most expansive country on the African continent" to emphasize the vastness of the country. Lastly, "the largest nation in the African continent" is another way to express the same idea in a slightly different way.