First, I hope that I understood what you wanted to ask. If this is not what you exactly meant, you can write a comment and I shall delete/edit the question.
But then, if this is what you meant, the question is too broad to explain. But, you should at least understand that this structure is widely used to mean that something/body is like something/body. See here -
Mary is as good as Julie in studies - They have (nearly) same expertise in studies.
To mean that something/body is NOT like something/body, you use it by putting 'not' as here. In addition, the phrase can also be used to mean nearly or even uncertainty as described here.
Please note that this is just one use of as + adjective + as. Refer some good dictionary to learn more. I just tried to make you understand the commonest use of the phrase as...as.