The best replacement for obligation is responsibility.

The best alternatives to obligation are rated as following:
★★★★★  responsibility
★★★  commitment
★★★  duty
★★  opportunity
★★  revenue bonds
★  liability
★  projected benefit obligation
★  desire
★  obligations
  legal obligation
  necessity
  accumulated benefit obligation
  individual responsibility
  morality of happiness
  moral obligation
  social responsibility
  actual obligation
  no obligation
  perform a duty
  revenue bond

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obligation
responsibility
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