innovational vs groundbreaking

innovational is not a noun while groundbreaking is a noun.

Word	Noun	Adjective	Verb	Adverb
innovational	No	Yes	No	No
groundbreaking	Yes	Yes	No	No

As adjectives, innovational and groundbreaking are synonyms defined as:

innovational and groundbreaking: being or producing something like nothing done or experienced or created before

Other synonyms of innovational include innovative.

innovational (noun)	groundbreaking (noun)
	the ceremonial breaking of the ground to formally begin a construction project

innovational (adjective)	groundbreaking (adjective)
being or producing something like nothing done or experienced or created before	being or producing something like nothing done or experienced or created before