emphasis You use everywhere to emphasize that you are talking about a large number of places, or all possible places. I saw her picture everywhere I looked everywhere. I couldn't find him
You use everywhere to refer to a whole area or to all the places in a particular area. Working people everywhere object to paying taxes We went everywhere together Dust is everywhere People come here from everywhere to see these lights
You use everywhere to refer to all the places that someone goes to. Bradley is still accustomed to travelling everywhere in style Everywhere he went he was introduced as the current United States Open Champion
If you say that someone or something is everywhere, you mean that they are present in a place in very large numbers. There were cartons of cigarettes everywhere
to or in any or all places; "You find fast food stores everywhere"; "people everywhere are becoming aware of the problem"; "he carried a gun everywhere he went"; "looked all over for a suitable gift"; (`everyplace' is used informally for `everywhere')