Definition:
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.
Examples:
I am a professional in my job.
He is a true professional.
These medical professionals have expertise in treating patients.
Definition:
'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.
Examples:
She is a professional dancer.
The professional team won the championship.
His professional approach to his work is commendable.
Tips:
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.