1000000000000 vs one million million

1000000000000 and one million million both are nouns.

Word	Noun	Adjective	Verb	Adverb
1000000000000	Yes	No	No	No
one million million	Yes	No	No	No

As nouns, 1000000000000 and one million million are synonyms defined as:

1000000000000 and one million million: the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen

Other synonyms of 1000000000000 include billion.

As nouns, 1000000000000 and one million million are synonyms defined as:

1000000000000 and one million million: the number that is represented as a one followed by 12 zeros

Other synonyms of 1000000000000 include trillion.

1000000000000 (noun)	one million million (noun)
the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen	the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen
the number that is represented as a one followed by 12 zeros	the number that is represented as a one followed by 12 zeros