troth vs pledge

troth and pledge both are nouns.

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

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

Other hypernyms of troth include assurance.

troth (noun)	pledge (noun)
a solemn pledge of fidelity	a binding commitment to do or give or refrain from something
a mutual promise to marry	a drink in honor of or to the health of a person or event
	someone accepted for membership but not yet fully admitted to the group
	a deposit of personal property as security for a debt

troth (verb)	pledge (verb)
	promise solemnly and formally
	bind or secure by a pledge
	give as a guarantee
	propose a toast to
	pay (an amount of money) as a contribution to a charity or service, especially at regular intervals