contact vs tangency

contact and tangency both are nouns.

Word	Noun	Adjective	Verb	Adverb
contact	Yes	No	Yes	No
tangency	Yes	No	No	No

As nouns, contact and tangency are synonyms defined as:

contact and tangency: (electronics) a junction where things (as two electrical conductors) touch or are in physical contact

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

contact: the state or condition of touching or of being in immediate proximity
tangency: the state of being tangent; having contact at a single point or along a line without crossing

Other hyponyms of contact include osculation.

contact (noun)	tangency (noun)
the act of touching physically	(electronics) a junction where things (as two electrical conductors) touch or are in physical contact
close interaction	the state of being tangent; having contact at a single point or along a line without crossing
(electronics) a junction where things (as two electrical conductors) touch or are in physical contact
a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication
a channel for communication between groups
a communicative interaction
the physical coming together of two or more things
a person who is in a position to give you special assistance
the state or condition of touching or of being in immediate proximity

contact (verb)	tangency (verb)
be in or establish communication with
be in direct physical contact with; make contact