Nouns

(n)million, 1000000, one thousand thousand, megthe number that is represented as a one followed by 6 zeros
(n)million, billion, trillion, zillion, jillion, gazillion, bazilliona very large indefinite number (usually hyperbole)“there were millions of flies”

Adjectives

(s)million(in Roman numerals, M written with a macron over it) denoting a quantity consisting of 1,000,000 items or units