troth vs assurance

troth and assurance both are nouns.

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

As nouns, assurance is a hypernym of troth; that is, assurance is a word with a broader meaning than troth:

Other hypernyms of troth include pledge.

troth (noun)	assurance (noun)
a solemn pledge of fidelity	freedom from doubt; belief in yourself and your abilities
a mutual promise to marry	a statement intended to inspire confidence
	a binding commitment to do or give or refrain from something
	a British term for some kinds of insurance