I know that these little useful words er, eh, ehe and eher have different meanings and usage. The problem is that when I try to pronounce them, they sound very, very similar. Especially inside a sentence and not as single, clearly pronounced words (which I can find in any online dictionary).
I wonder if natives, in everyday speaking, pronounce them in the same way or not. In this case is the pronunciation important in order to get the right meaning or is it just a matter of context and position of the word?
I'm asking because I'm interested in achieving a good German accent and since I didn't know about their existence, I haven't clearly heard these words pronounced by natives yet (except for er).
[edit: added er as suggested in the comments]