My mother is a professor .is an academic rank at universities 
Thats interesting! What does she teach?
Professor
Professor (commonly abbreviated as Prof.) is an academic rank at universities and other post-secondary education and research institutions in most countries. Literally, "professor" derives from Latin as a "person who professes" being usually an expert in arts or sciences, a teacher of the highest rank.
In most systems of academic ranks the word "Professor" only refers to the most senior academic position, sometimes informally known as "full professor". In some countries or institutions, the word "professor"
Docent
Docent is a title at some European universities to denote a specific academic appointment within a set structure of academic ranks at or below the full professor rank, similar to a British readership and equal or above the title "associate professor".
Description.
Docent is also used at some (mainly German) universities generically for a person who has the right to teach. The term is derived from the Latin word "docēns", which is the present active participle of "docēre" (to teach, to