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1. Is the word "straight" in "I am straight" a noun or an adjective?

2. Can you say " I am not a gay but I am a straight"?

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Bn77 Can you say "I am not a gay but I am a straight"?

No. Those words are not used like that, i.e., as nouns.

CJ

Comments  

I am straight -Straight is an adjective. When somebody says that, the message is saying "I am not gay".
 CalifJim's reply was promoted to an answer.