Hey sis
I thin to define opposites, you have to define something. I don't think that there are absolutes. Within semantics, lets say you have a lamp post. Well, there are thousands of different types, all various sizes, colors etc. So, the opposite of whatever that group of identities are - and they could be a drawing of a lamp post or a picture or the word could be an infinite amount of possibilities of that things antithises.
I guess what I'm saying is that you have no opposites without first identifyine the signifier. This is impossible. What is a breathe? Who is breathing? Whos self are we talking about?