* Maulana
is the a title given to an Aalim out of respect, it means "our leader"

* Mullah
A variation of the above

* Hafiz
A person who has committed to memory the entire Quran.

* Maulvi
An indo-pak term for an Aalim, although used today by people to mean Aalim's who eat a lot!

* Imam
The person leading Salah

* Sheikh
An Arab term of respect, similar to Maulana, can also be used for old people.
* Peer Sahib
An indo-pak term to describe a spiritual leader

* Awliya / Wali Allah
A term to describe a very pious man. A person who has a real connection with Allah.

* Sufi Sahib
An indo-pak term of respect, loosely used for a person with a beard

* Ameer Sahib
A respectful term used for the leader of a group, for example when traveling.
* Ayatollah
Used for a religious leader in Iran, popular amongst the Shia community.

* Chisti
A branch of Sufi-ism. There are four popular one's, Chisti, Naqshbandi, Qadri and Soharwardi.

* Fakir
Not sure

* Qari
A person who knows the rules of recitation of the Quran (tajweed), and can apply them. He can correctly pronounce each and every letter ccording to it's rules

* Mufti
A person who has the authority to give a FATWA, a special ruling that caters to a specific problem.