Give one word substitute. A well experienced person.

Correct answer: Veteran

Explanation: Veteran is a single word meaning a person who has long experience in a particular field or activity, which directly matches the request for a one-word substitute for "a well experienced person."

• Wise man — two words and emphasizes wisdom or good judgment rather than specifically long experience.

• Intelligent — describes mental ability, not the length of experience in a field.

• Old man — refers to age and is two words; age does not necessarily imply the required professional or practical experience.