Federation's rhymes with:
federations, federations, considerations, federations, aberrations, admirations, alterations, aspirations, collaborations, commemorations, configurations, considerations, cooperations, corporation's, corporations, corporations', declarations, decorations, deliberations, discolorations, exaggerations, expirations, exploration's, explorations, federations, generation's, generations, inaugurations, incorporation's, incorporations, inspirations, lacerations, operation's, operations, operations', perforations, preparations, reparations, restorations, reverberations, separations, ulcerations