T-junction vs junction

T-junction and junction both are nouns.

Word	Noun	Adjective	Verb	Adverb
T-junction	Yes	No	No	No
junction	Yes	No	No	No

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

T-junction (noun)	junction (noun)
a junction where two roads or pipes etc. meet to form a T	an act of joining or adjoining things
	the place where two or more things come together
	something that joins or connects
	the shape or manner in which things come together and a connection is made
	the state of being joined together