hi, I have one thing to ask. I want to know how I can get over voca confusion.
I think english has so many words than any other language. for example, like I said before, what's the difference between voca (I forgot spellings) and words? and another things like these things....
raise, rise,
reduce, decreace, go down,
great nice amazing increadible
purchace, buy
connect, contact a lot more........
I know there even slight difference but can't find it out especially in the context, or when I try speaking.
this kind of confusion is mainly one of the reason why I can't speak english fluently.
writing on the net is fine because I can look up dictionary while I write. but speaking in front of many people I'm frozen up

do you have any suggestion to get over this problem and become flunt english speaker?