Obviously, for the words sight and site, the confusion stems from the fact that they are pronounced the same way. These two are what we call homonyms: words that sound the same but have entirely different meanings. It does not matter how they are spelled—if they are actually spelled the same or differently. As long as they are pronounced the same way, they are called homonyms. What’s even confusing for these two is not just that they are pronounced the same. Their meanings actually seem the same as well. What people should look out for when using these two is the context of how they are going to be used.
Sight is commonly used as a noun, and this has various meanings. It can imply the ability to see (sight is one of the five senses) or can also be a tool for things that need focus such as a firearm. That whole on the top area of the firearm where people take a peep at is the sight.
Often times, you might also hear the phrase “sights and sounds”. Sights can, in general, also mean the things you see, as how it is used in the mentioned phrase. For instance, when you travel, the sights you see there would be the Eiffel Tower of Paris or the Statue of Liberty in New York. In this context, sight can also mean a place.
Site, on the other hand, is also a noun. While it also means location or place, the physical geographical place, like a construction site, this one would imply a more specific use. The word site is often used as a reference point like when using maps or pertaining to a certain place to meet up in. Sight, although can also pertain to a location as mentioned earlier, is more descriptive for places or locations that should not be missed.