commitment vs seriousness

commitment and seriousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
commitment	Yes	No	No	No
seriousness	Yes	No	No	No

As nouns, seriousness is a hypernym of commitment; that is, seriousness is a word with a broader meaning than commitment:

Other hypernyms of commitment include earnestness, serious-mindedness, sincerity.

commitment (noun)	seriousness (noun)
the act of binding yourself (intellectually or emotionally) to a course of action	the trait of being serious
the official act of consigning a person to confinement (as in a prison or mental hospital)	the quality of arousing fear or distress
an engagement by contract involving financial obligation	an earnest and sincere feeling
the trait of sincere and steadfast fixity of purpose
a message that makes a pledge