Everyone and every one are pronounced the same but have different meanings.
Everyone, and everybody, talks about all the people in a particular group. It talks about the group as a whole. It only talks about people.
Every one talks about each individual or thing in a group, not the group as a whole. It’s always used with a singular verb. It can talk about people or to things.
- Everyone was looking at her.
(All the people in the group were looking at her.) - With everyone gone, she could enjoy the silence.
- I failed every one of the exams.
(There were many exams and I failed them all.) - She has read every one of his books.
