"volunteer" in the noun sense
1. volunteer, military volunteer, voluntary
military) a person who freely enlists for service
2. volunteer, unpaid worker
a person who performs voluntary work
3. Tennessean, Volunteer
a native or resident of Tennessee
"volunteer" in the verb sense
"He volunteered the information"
2. volunteer, offer
"She volunteered to drive the old lady home"
"I offered to help with the dishes but the hostess would not hear of it"
do volunteer work
"volunteer" in the adjective sense
1. unpaid, volunteer
"the soup kitchen was run primarily by unpaid helpers"
"a volunteer fire department"
Source: WordNet® (An amazing lexical database of English)
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