agent

noun

• Chemical with the power to make chemical reactions
• Person who represents or decides for others
• A spy; someone who spies on other countries
• A person whose job is to act for, represent, or promote the interests of another person or organization.
• A thing or person that causes something to happen.
• A substance that produces a particular effect.
• The person or thing performing the action in a sentence.
• A person who works secretly for an organization or government.
• A person who acts on behalf of another person or organization.