receiver vs annuitant

receiver and annuitant both are nouns.

Word	Noun	Adjective	Verb	Adverb
receiver	Yes	No	No	No
annuitant	Yes	No	No	No

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

receiver (noun)	annuitant (noun)
set that receives radio or tv signals	the recipient of an annuity
earphone that converts electrical signals into sounds
a person who receives something
(law) a person (usually appointed by a court of law) who liquidates assets or preserves them for the benefit of affected parties
a football player who catches (or is supposed to catch) a forward pass
the tennis player who receives the serve