sponsor vs patroness

sponsor and patroness both are nouns.

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

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

sponsor (noun)	patroness (noun)
someone who supports or champions something	a woman who is a patron or the wife of a patron
an advocate who presents a person (as for an award or a degree or an introduction etc.)

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