The word "guaira" (often spelled "Guaíra") refers to a specific place, namely a great waterfall located on the border between Brazil and Paraguay. It's important to note that "Guaíra" is not a common English word you would use in everyday conversation, but it is a proper noun referring to a geographical feature.
Since "Guaíra" refers specifically to a place, it does not have many variants or different meanings. However, when discussing it in a broader context, you could use it in relation to topics like tourism, geography, or nature conservation.
In summary, "guaíra" is a proper noun that denotes a significant waterfall on the Brazil-Paraguay border. When discussing it, you can refer to its beauty, its location, and its appeal to tourists.