trillion vs gazillion

trillion and gazillion both are nouns.

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

As nouns, trillion and gazillion are synonyms defined as:

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

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

trillion (noun)	gazillion (noun)
the number that is represented as a one followed by 12 zeros	a very large indefinite number (usually hyperbole)
the number that is represented as a one followed by 18 zeros in the UK
a very large indefinite number (usually hyperbole)

trillion (adjective)	gazillion (adjective)
one million million in the United States
one quintillion in Great Britain