What is the difference between something mandatory, and something compulsory ?
Well, "mandatory" is related to the word "mandate", which is a rule or a law. "Compulsory" is related to "compulsive", which means that some kind of force pushes a person to do something, and also "compel", which means to force somebody to do something.
My intuition tells me that "mandatory" implies that something is required because of a rule or law. "Compulsory" has another layer to it. There is a thing that is mandatory, and then somebody forces ("compels") somebody else to do that thing. For example, schools force their students to take certain subjects. Those subjects are often called "compulsory subjects".
What is the difference between the "final" and the "eventual" ?
"Final" is simply the last thing in a series of things. "Eventual" implies that the series of things is relatively large or takes a long time to occur. "Eventual" can also mean "inevitable" or "unavoidable".
What is the difference between something analog to something, and something similar to something ?
As far as I understand, "analog" means a close representation of something else. An example is "analog recording". "Similar" just means that two things share some (but not all) of the same properties. For example, thing A and thing B might have the same shape, but be different colors. They are similar, because they share some features, but they are not analogous, because neither one is meant to represent the other.
Why is there 2 synonymous words for everything ?
Because it makes language more engaging, enjoyable, and fun.
How do you feel about people from all countries learning especially your language ?
I'm a professor who teaches English as a foreign language, and I love seeing my students' skills improve. English is hard, but so is every language in its own way.