convenience vs patness

convenience and patness both are nouns.

Word	Noun	Adjective	Verb	Adverb
convenience	Yes	No	No	No
patness	Yes	No	No	No

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

Other hyponyms of convenience include opportuneness, timeliness, accessibility, availability, availableness, handiness.

convenience (noun)	patness (noun)
a device or control that is very useful for a particular job	timely convenience
a toilet that is available to the public
the quality of being useful and convenient
the state of being suitable or opportune