Everyday vs Every day
Everyday and every day are commonly confused in English.
There's no difference in pronunciation, but using the wrong one when writing is a mistake in the everyday English you use every day.
Everyday
Everyday is a single word and is an adjective, so it's the one that is used in front of a noun to describe something as commonplace, usual, regular, ordinary, or normal.
• These shoes are great for everyday wear
• You shouldn't wear an everyday outfit to the wedding
• Don't use the everyday dishes - it's a special occasion
Every day
Every day is an adjective (every) plus a noun (day), and it means 'each day'.
An easy rule of thumb: if you can substitute “each day” and your sentence still makes sense, use two words
• I go to the park every day
• I have to work every day this week except Friday
• Every day I feel a little better
"The medicine cabinet was filled every day [each day] with everyday [commonplace/usual] drugs like aspirin and Tylenol."
“I wear my everyday [regular] shoes to work every day [each day]”.