Someone who does a job purely for money, rather than out of interest in the work itself.
A horse for hire.
An employee who is hired, often to perform unpleasant tasks with little independence.
One who enters into, or offers themself for, any service of their own free will, especially when done without pay.
A plant that grows spontaneously, without being cultivated on purpose; see volunteer plant in Wikipedia.
A voluntary member of the organized militia of a country, as distinguished from a regular or member of the standing army.
One who enters into military service voluntarily (but who, when in service, is subject to discipline and regulations like other soldiers), as opposed to a conscript.
A native or resident of the American state of Tennessee.
A person who acts out of their own will without a legal obligation, such as a donor.
To offer, usually unprompted.
To grow without human sowing or intentional cultivation.
To enlist oneself as a volunteer.
To offer the services of (someone else) to do something.
To do or offer to do something voluntarily.