What are the main differences between Mormons and Jehovah's Witnesses? Both Mormons and Jehovah's Witnesses go from door to door, talking to people about their beliefs. Also neither group accepts the notion of Trinity.

What are the main differences between these two denominations?
There are many doctrinal and practical differences between Jehovah's Witnesses and Mormons. I think it will be difficult to arrange a complete and comprehensive list, but below are a collection of differences that immediately come to mind.


Mormons claim to be a restoration of ancient Christianity via divine intervention and angelic visitation. Jehovah's Witnesses claim to be a rediscovery of ancient Christianity through biblical scholarship.
Jehovah's Witnesses hold the use of the correct name of God, Jehovah, to be very important to true worship. Mormons do have beliefs about the correct names of God the Father and Jesus Christ, but do not hold them to the same level of importance as Jehovah's Witnesses do.
Mormons believe that Jesus Christ is Jehovah, that Adam is Michael the Archangel, and that the true name of God the Father is Elohim. Jehovah's Witnesses believe that Jesus Christ is Michael the Archangel, and that the true name of God the Father is Jehovah. 
Mormons believe that the Bible contains errors and rely on additional books of scriptures and revelations from modern prophets to interpret it. Jehovah's Witnesses believe that the Bible is completely correct and internally consistent and derive all of their doctrine from their interpretation of it.
Mormons believe in a Spirit World between death and resurrection, Jehovah's witnesses believe that after death the self ceases to exist until resurrection.
Mormons call the Lord's Supper the Sacrament, substitute water for wine, and partake of it weekly on Sundays. Jehovah's witnesses call the Lord's Supper the Lord's Evening Meal and allow only a few worthy to partake of it once a year. 
Mormon missionaries are largely young men and women called to serve 18 months to 2 years, other than this, most Mormons do not actively preach door to door. Jehovah's Witnesses believe that it is their responsibility as Christians to witness door to door and hold witnessing as requirement for true membership.