Onus
Part of speech: noun
Definition: A legal obligation. Burden of proof, onus probandi Stigma. Blame. Responsibility; burden.
Burden
Part of speech: verb
Definition: To encumber with a burden (in any of the noun senses of the word).
Part of speech: noun
Definition: Theme, core idea.A heavy load.A responsibility, onus.A cause of worry.
Example sentence: God places the heaviest burden on those who can carry its weight.