hesitancy vs reluctance

hesitancy and reluctance both are nouns.

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

As nouns, hesitancy and reluctance are synonyms defined as:

Other synonyms of hesitancy include disinclination, hesitation, indisposition.

hesitancy (noun)	reluctance (noun)
a certain degree of unwillingness	a certain degree of unwillingness
a feeling of diffidence and indecision about doing something	(physics) opposition to magnetic flux (analogous to electric resistance)