interspersion vs interspersal

interspersion and interspersal both are nouns.

Word	Noun	Adjective	Verb	Adverb
interspersion	Yes	No	No	No
interspersal	Yes	No	No	No

As nouns, interspersion and interspersal are synonyms defined as:

interspersion and interspersal: the act of combining one thing at intervals among other things

interspersion (noun)	interspersal (noun)
the act of combining one thing at intervals among other things	the act of combining one thing at intervals among other things