dependency vs reliance

dependency and reliance both are nouns.

Word	Noun	Adjective	Verb	Adverb
dependency	Yes	No	No	No
reliance	Yes	No	No	No

As nouns, reliance is a hyponym of dependency; that is, reliance is a word with a more specific, narrower meaning than dependency:

dependency: the state of relying on or being controlled by someone or something else
reliance: the state of relying on something

Other hyponyms of dependency include helplessness, subordination, contingency.

dependency (noun)	reliance (noun)
a geographical area politically controlled by a distant country	certainty based on past experience
the state of relying on or being controlled by someone or something else	the state of relying on something
being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)