dependence vs dependency

dependence and dependency both are nouns.

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

As nouns, dependence and dependency are synonyms defined as:

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

Other synonyms of dependence include dependance.

As nouns, dependence and dependency are synonyms defined as:

dependence and dependency: being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)

Other synonyms of dependence include addiction, dependance, habituation.

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