hesitancy vs hesitation

hesitancy and hesitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
hesitancy	Yes	No	No	No
hesitation	Yes	No	No	No

As nouns, hesitancy and hesitation are synonyms defined as:

Other synonyms of hesitancy include disinclination, indisposition, reluctance.

hesitancy (noun)	hesitation (noun)
a certain degree of unwillingness	the act of pausing uncertainly
a feeling of diffidence and indecision about doing something	a certain degree of unwillingness
	indecision in speech or action