a professional is a noun that means a person who is an expert in a particular field or task and engages in it regularly as a job.
I am a professional in my job.
He is a true professional.
These medical professionals have expertise in treating patients.
'professional' adjective describes someone or something as legally qualified, skillful, or having a degree in a certain field or profession. When using professional in an adjective capacity, it can occur with or without articles before it.
She is a professional dancer.
The professional team won the championship.
His professional approach to his work is commendable.
professional can be used to describe someone’s manner or capabilities. Be sure not to confuse the adjective and the noun when using professional in a sentence.