ADJ

unpaid
The office is staffed by unpaid volunteers
full-time, part-time
committed, dedicated, enthusiastic, willing
qualified, trained
potential, prospective, would-be
conservation, Red Cross

QUANT

army, band, group, network, team
An army of volunteers cooked meals for the children

VERB + VOLUNTEER

appeal for, ask for, call for, look for
The charity is appealing for volunteers to take elderly patients to and from hospital
find, get, recruit
We can't get any volunteers to help in the gardens
provide
The local community provided volunteers to repair the road
encourage
need, want
work as

VOLUNTEER + VERB

come forward
Hundreds of volunteers have come forward to offer their help
man sth, staff sth
carry sth out
provide support, support sb
The support our volunteers provide cannot be measured in purely practical terms

VOLUNTEER + NOUN

staff, worker
carer, driver, helper

PREP

~ for
He worked as a volunteer for Oxfam

ADJ

army, civilian

VERB + VOLUNTEER

recruit
serve as

VOLUNTEER + NOUN

army, militia, unit