There are two main prestigious awards- giving bodies for actors or simply put two major ceremonies in the entertainment industry. We have the Golden Globes, while the second one is called the Oscar. There is a very clear difference between the two. The issue is that some people have named another third; they call it the Academy Awards.
In the real sense, the Academy Award is actually the same as Oscar. Oscar is just very much popular and also the term Oscar is more frequently used than Academy Award to refer the same award. Academy Award is actually more formal, and it is also the original term that was given to the award, unlike Oscar, which is very commonly used, and the more popular, newer term used for the same award.
Oscar, in some cases, also refers to the names of real persons, which are from whom the popular and alternative nickname to the Academy Award was derived.