persistency vs determination

persistency and determination both are nouns.

Word	Noun	Adjective	Verb	Adverb
persistency	Yes	No	No	No
determination	Yes	No	No	No

As nouns, determination is a hypernym of persistency; that is, determination is a word with a broader meaning than persistency:

persistency: persistent determination
determination: the quality of being determined to do or achieve something; firmness of purpose

Other hypernyms of persistency include purpose.

persistency (noun)	determination (noun)
persistent determination	the act of determining the properties of something, usually by research or calculation
	the act of making up your mind about something
	the quality of being determined to do or achieve something; firmness of purpose
	a position or opinion or judgment reached after consideration
	deciding or controlling something's outcome or nature