predominance vs patency

predominance and patency both are nouns.

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

As nouns, patency is a hypernym of predominance; that is, patency is a word with a broader meaning than predominance:

Other hypernyms of predominance include noticeability, noticeableness, obviousness.

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