How can i identity a noun and an adjective if there close to being the same definition
is there any tips?
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explanation:

i can't think of an example that fits your criteria. the position of the adjective would give it away. adjectives come before nouns. that's case one. the red house. red is an adjective describing house.

linking verbs (is am are) can be followed by an adjective. the sky is blue.

you know that is an adjective because you could write it as

the blue sky is

my favorite example of this is

bromothymal blue is yellow (when the ph is 2.1)   this is a chemical indicator that is usually blue or green around ph 7, but it will go yellow when in a very acidic solution.

the point i'm making is that blue in this case is a noun at it is being modified by yellow which is an adjective, not quite the same thing as what you are asking about. but position does tell the tale. yellow bromothymol blue is in a solution of ph 2.1.