Word Study
unionize
OXFORD DICTIONARY
unionize, v.tr. & intr. (also -ise) bring or come under trade-union organization or rules.
Derivative
unionization n.
THESAURUS
unionize
affiliate, ally, associate, band together, be in cahoots, bunch, bunch up, cabal, cement a union, centralize, club, club together, come together, confederate, consociate, conspire, couple, federalize, federate, gang, gang up, go in partners, go in partnership, hook up with, join forces, join fortunes with, join together, join up with, join with, league, marry, organize, pair, pair off, partner, stand together, stand up with, team up with, team with, throw in with, tie in with, tie up with, unite with, wedFor further exploring for "unionize" in Webster Dictionary Online