3 synonym groups for Feder

springy, elastic, resilient, buoyant, lively, flexible, supple, sprightly, energetic, perky, spirited, vibrant, effervescent, bubbly, peppy, zippy, jaunty, animated, vivacious, dynamic, active, frisky, bouncy [x]

driving force, impetus, motive power, propelling force, driving factor, main driver, primary force, central force, key factor, main influence, primary influence, core force, essential force, fundamental force, principal force, main impetus, main propellant, main stimulus, main motivator, main engine, main catalyst, main instigator, main activator, main energizer, main mover, main dynamo, main generator, main originator, main source, main wellspring, main wellhead, main fountainhead, main root, main cause, main reason, main springboard, main trigger, main spark, main ignition, main initiator, main promoter, main supporter, main sustainer, main upholder, main backbone, main pillar, main foundation [x]

alliances, unions, coalitions, confederations, leagues, associations, partnerships, consortiums, syndicates, blocs, organizations, groups, networks, assemblies, councils, societies, fraternities, guilds, clubs, orders, brotherhoods, sisterhoods, federacies, federations [x]