As nouns the difference between nos and ea

is that nos is plural of lang=en while ea is a river or watercourse.

As an abbreviation ea is

alternative form of ea.|lang=en.

As an initialism EA is

Enterprise Architecture: a framework used to manage and align an organization's business processes, Information Technology (IT) data, software and hardware, with the organization's overall strategy.

As a proper noun Ea is

name of Enki in Akkadian and Babylonian mythology.