innovator vs groundbreaker

innovator and groundbreaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
innovator	Yes	No	No	No
groundbreaker	Yes	No	No	No

As nouns, innovator and groundbreaker are synonyms defined as:

innovator and groundbreaker: someone who helps to open up a new line of research or technology or art

Other synonyms of innovator include pioneer, trailblazer.

innovator (noun)	groundbreaker (noun)
someone who helps to open up a new line of research or technology or art	someone who helps to open up a new line of research or technology or art