junction vs splice

junction and splice both are nouns.

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

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

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

Other hyponyms of junction include contact, tangency, joint, barrier strip, junction barrier, splicing, thermojunction.

junction (noun)	splice (noun)
an act of joining or adjoining things	joint made by overlapping two ends and joining them together
the place where two or more things come together	a junction where two things (as paper or film or magnetic tape) have been joined 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

junction (verb)	splice (verb)
	join by interweaving strands
	join the ends of
	join together so as to form new genetic combinations
	perform a marriage ceremony