sponsor vs guarantor

sponsor and guarantor both are nouns.

Word	Noun	Adjective	Verb	Adverb
sponsor	Yes	No	Yes	No
guarantor	Yes	No	No	No

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

sponsor (noun)	guarantor (noun)
someone who supports or champions something	one who provides a warrant or guarantee to another
an advocate who presents a person (as for an award or a degree or an introduction etc.)

sponsor (verb)	guarantor (verb)
assume sponsorship of
assume responsibility for or leadership of
do one's shopping at; do business with; be a customer or client of