An attendant is a person, an assistant, employed to help people, whereas attendance refers to the number of people present. Both are nouns and both can functions as adjectives,
 attedant list <list of assistants>
 attendance list <list of people present>
And both can be modified,
 employee attendance list <list of employees present>
 employee attendant list <list of employees who are attendants> *odd
Hope that helps.