reliability vs dependability

reliability and dependability both are nouns.

Word	Noun	Adjective	Verb	Adverb
reliability	Yes	No	No	No
dependability	Yes	No	No	No

As nouns, reliability and dependability are synonyms defined as:

reliability and dependability: the quality of being dependable or reliable

Other synonyms of reliability include dependableness, reliableness.

reliability (noun)	dependability (noun)
the quality of being dependable or reliable	the quality of being dependable or reliable