p-n junction vs tangency

p-n junction and tangency both are nouns.

Word	Noun	Adjective	Verb	Adverb
p-n junction	Yes	No	No	No
tangency	Yes	No	No	No

As nouns, tangency is a hypernym of p-n junction; that is, tangency is a word with a broader meaning than p-n junction:

p-n junction: the junction between a p-type semiconductor and an n-type semiconductor
tangency: (electronics) a junction where things (as two electrical conductors) touch or are in physical contact

Other hypernyms of p-n junction include contact.

p-n junction (noun)	tangency (noun)
the junction between a p-type semiconductor and an n-type semiconductor	(electronics) a junction where things (as two electrical conductors) touch or are in physical contact
	the state of being tangent; having contact at a single point or along a line without crossing