unavoidability vs ineluctability

unavoidability and ineluctability both are nouns.

Word	Noun	Adjective	Verb	Adverb
unavoidability	Yes	No	No	No
ineluctability	Yes	No	No	No

As nouns, unavoidability and ineluctability are synonyms defined as:

unavoidability and ineluctability: the quality of being impossible to avoid or evade

unavoidability (noun)	ineluctability (noun)
the quality of being impossible to avoid or evade	the quality of being impossible to avoid or evade