What's difference between everyday and every day?

everyday is an adjective. It answers the question What kind?

everyday matters, everyday conversion, everyday routines

every day is an adverb phrase. It answers the question When?

We do the same thing every day.
Every day the postman comes at 2 o'clock.

Everyday is an adjective
Every day is a noun phrase.

Both can be found at [url=http://www.onelook.com /]ONE LOOK DICTIONARY SEARCH[/url].
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Mornin', Jim.
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Evenin', Mr. M.

I should have said noun phrase used as an adverb, maybe?

Mister Micawber & Jim,