summative vs summational

summative and summational both are adjectives.

Word	Noun	Adjective	Verb	Adverb
summative	No	Yes	No	No
summational	No	Yes	No	No

As adjectives, summative and summational are synonyms defined as:

summative and summational: of or relating to a summation or produced by summation

summative (adjective)	summational (adjective)
of or relating to a summation or produced by summation	of or relating to a summation or produced by summation