Who is Guru not Teacher. What is the difference between them. Types of teacher.

A Guru is not a Teacher. A Guru is one who has acknowledged me (us), in person, enlightened me (us) gave me (us) the purpose to live and who has shown me (us) the path through which I ( we) can progress.

Guru Govind Dou Khade Kako Lagu Paw,

Balihari Guru Apno Jin Govind Diyo Bataye. 

Means Guru and God both r standing together, whose feet I (we) have to touch first. Its the Guru who has given  me(us) the knowledge only through which we came to know (recognized)God, so Guru's feet (to bow down before or take blessing)  should be touched First..

 Types of Teachers:

• Guru was the one who used to lead a gruhasta (family) life and earn his livelihood himself or after imparting education or knowledge to his disciples and maintain his family or lives alone. 
• Acharya  - He is a Master of his subject. Acharya Drone of Mahabharata period was master in war education. Kripacharya was master in Veda. Chanakya was master of Arthsastra (Economics) and Administration.
• Upadhyaya was the one who adopted teaching as a profession to earn his livelihood and taught only a portion of the Veda or Vedangas.
• Charakas or wandering scholars toured the country in quest of higher knowledge. Thought not normally competent as teachers they were regarded as possible source of knowledge by Satapatha Brahmana. Hiuen Tsang was struck with the knowledge gained by some of the wandering teachers (called Bhikkhus and Sadhus during his times) and who had accumulated a treasure of knowledge by constant travel and who used to gladly impart it to others.
• Yaujanasatika were teachers famous for their profound scholarship that students from distant places, as far as from a distance of hundreds of miles would come to seek their guidance.
• Sikshaka was a teacher who gave instruction in arts like dancing.