splicing vs splice

splicing and splice both are nouns.

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

As nouns, splicing and splice are synonyms defined as:

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

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

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