Select the option that can be used as a one-word substitute for the given group of words.

One who has a long experience of any occupation

Veteran

The one-word substitute for "one who has a long experience of any occupation" is veteran.

• Reverent means showing deep respect or awe.
• Practitioner means a person who engages in a particular activity or profession.
• Staunch means firm in one's beliefs or principles.
• Veteran means a person who has had long experience in a particular occupation or field.