commitment vs assurance

commitment and assurance both are nouns.

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

As nouns, assurance is a hyponym of commitment; that is, assurance is a word with a more specific, narrower meaning than commitment:

Other hyponyms of commitment include oath, swearing, affirmation, promise, pledge.

commitment (noun)	assurance (noun)
the act of binding yourself (intellectually or emotionally) to a course of action	freedom from doubt; belief in yourself and your abilities
the official act of consigning a person to confinement (as in a prison or mental hospital)	a statement intended to inspire confidence
an engagement by contract involving financial obligation	a binding commitment to do or give or refrain from something
the trait of sincere and steadfast fixity of purpose	a British term for some kinds of insurance
a message that makes a pledge