splicing vs junction

splicing and junction both are nouns.

Word	Noun	Adjective	Verb	Adverb
splicing	Yes	No	No	No
junction	Yes	No	No	No

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

splicing: a junction where two things (as paper or film or magnetic tape) have been joined together
junction: something that joins or connects

Other hypernyms of splicing include conjunction.

splicing (noun)	junction (noun)
a junction where two things (as paper or film or magnetic tape) have been joined together	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