splice vs intertwine

splice is a noun but intertwine is not a noun.

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

As verbs, intertwine is a hypernym of splice; that is, intertwine is a word with a broader meaning than splice:

Other hypernyms of splice include enlace, entwine, interlace, lace, twine.

splice (noun)	intertwine (noun)
joint made by overlapping two ends and joining them together
a junction where two things (as paper or film or magnetic tape) have been joined together

splice (verb)	intertwine (verb)
join by interweaving strands	spin, wind, or twist together
join the ends of	make a loop in
join together so as to form new genetic combinations	make lacework by knotting or looping
perform a marriage ceremony