Synonyms of 'diagnose'
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If you can distinguish something, you can see, hear, or taste it although it is very difficult to detect.
He could distinguish voices.
If you can identify someone or something, you are able to recognize them or distinguish them from others.
I tried to identify her perfume.
Thesaurus for diagnose from the Collins English Thesaurus
If someone or something is diagnosed as having a particular illness or problem , their illness or problem is identified . If an illness or problem is diagnosed , it is identified.