survivorship annuity vs reversionary annuity

survivorship annuity and reversionary annuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
survivorship annuity	Yes	No	No	No
reversionary annuity	Yes	No	No	No

As nouns, survivorship annuity and reversionary annuity are synonyms defined as:

survivorship annuity and reversionary annuity: an annuity payable to one person in the event that someone else is unable to receive it

survivorship annuity (noun)	reversionary annuity (noun)
an annuity payable to one person in the event that someone else is unable to receive it	an annuity payable to one person in the event that someone else is unable to receive it