Thank you! i've read pal in few cases, but Dude is almost in every coloquial text, thank you so much for making things clear :)

They are very similar but here in the United States we don't really use the word pal as often. For example, I could say "You're my pal!" Meaning you're my friend (another word for friend is buddy) Also, for the word dude, we use it as more of a greeting like "Hey dude!" meaning hello guy, or to address someone "Dude! You're a great friend" it is more of a description word to describe the person being a guy. Guy and dude mean the same thing (man or boy)