patency vs predominance

patency and predominance both are nouns.

Word	Noun	Adjective	Verb	Adverb
patency	Yes	No	No	No
predominance	Yes	No	No	No

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

Other hyponyms of patency include apparency, apparentness, blatancy, predomination.

patency (noun)	predominance (noun)
the openness (lack of obstruction) of a bodily passage or duct	the quality of being more noticeable than anything else
the property of being easy to see and understand	the state of being predominant over others