gazillion vs zillion

gazillion and zillion both are nouns.

Word	Noun	Adjective	Verb	Adverb
gazillion	Yes	No	No	No
zillion	Yes	Yes	No	No

As nouns, gazillion and zillion are synonyms defined as:

gazillion and zillion: a very large indefinite number (usually hyperbole)

Other synonyms of gazillion include bazillion, billion, jillion, million, trillion.

gazillion (noun)	zillion (noun)
a very large indefinite number (usually hyperbole)	a very large indefinite number (usually hyperbole)

gazillion (adjective)	zillion (adjective)
	very large indeterminate number