Synonyms for Commitment:

n.

concept, idea, duty, philosophy, pledge, promise, principle, assurance, thought, theory, responsibility, belief, ideal. compulsion, confinement, accountability, delegation, concern, guardianship, onus, trust. obligation, operation, application, need, must, imperative, implementation, burden, adoption, exploitation, charge, consumption, use, wear, usage. will, ambition, perseverance, dynamism, energy, motivation, drive, resolve, determination, aspiration. assurance; obligation (noun)
engagement, promise, must, committal, charge, responsibility, need, duty, guarantee, undertaking, vow, pledge.
attribute (noun)
committedness.
commitment (noun)
committal, allegiance, loyalty, consignment, dedication, committedness.
committedness (noun)
involvement, devotion.
endeavor (noun)
maneuver, production, contract, exploit, effort, engagement, purpose, enterprise, undertaking, gambit, assay, performance, adventure, proceeding, essay, aim, approach, action, attempt, venture, deed, project, job, endeavor.
obligation (noun)
obligation.
promises (noun)
vow, oath, bond, guarantee.

v.

guarantee (verb)
pledge.

Other synonyms:

compulsion, belief, concept, principle, ideal, thought, philosophy, theory, accountability, duty, idea, guardianship, promise, onus. must, concern. trust, imperative. responsibility. need, burden. allegiance
devotion, allegiance.
necessity
obligation.
Other relevant words:
belief, charge, determination, imperative, thought, oath, dedication, loyalty, committal, theory, committedness, need, implementation, confinement, dynamism, burden, philosophy, ideal, aspiration, guarantee, pledge, energy, devotion, covenant, involvement, idea, accountability, trust, application, perseverance, delegation, onus, use, principle, drive, concern, ambition, adoption, resolve, must, promise, guardianship, consumption, consignment, responsibility, duty, compulsion, exploitation, allegiance, motivation, vow, assurance, obligation, usage, bond, wear, concept, operation, will.