Everyday = an adjective that describes a noun
Definition: happening every day or regularly; ordinary
Example: The Internet has become part of everyday life.
In this instance, ‘everyday’ is followed by a noun and is not used by itself at the end of a sentence.
Every day = a phrase that usually acts as an adverb
Definition: all of the days or each day over a period of time
Example: I drink coffee every day.
In this instance, you should separate ‘every’ and ‘day’ like ‘every hour’, ‘every week’, ‘every month’, etc. You don’ t write ‘everyhour’, do you? 🙂
Sponge ME, English Tuition (Singapore)