volunteer
noun
(military) a person who freely enlists for service
Oppositesdrafteea person who performs voluntary work
Synonymsunpaid workera native or resident of Tennessee
SynonymsTennessean
verb
tell voluntarily
“He volunteered the information”
agree freely
“She volunteered to drive the old lady home”
“I offered to help with the dishes but the hostess would not hear of it”
Synonymsofferdo volunteer work
adjective
without payment
“the soup kitchen was run primarily by unpaid helpers”
“a volunteer fire department”
Synonymsunpaid
Source: WordNet 3.1, Princeton University