settlor vs bestower

settlor and bestower both are nouns.

Word	Noun	Adjective	Verb	Adverb
settlor	Yes	No	No	No
bestower	Yes	No	No	No

As nouns, bestower is a hypernym of settlor; that is, bestower is a word with a broader meaning than settlor:

settlor: (law) a person who creates a trust by giving real or personal property in trust to a trustee for the benefit of a beneficiary; a person who gives such property is said to settle it on the trustee
bestower: person who makes a gift of property

Other hypernyms of settlor include conferrer, donor, giver, presenter.

settlor (noun)	bestower (noun)
(law) a person who creates a trust by giving real or personal property in trust to a trustee for the benefit of a beneficiary; a person who gives such property is said to settle it on the trustee	person who makes a gift of property