Question: what are the words to start an essay?
Answer: Moreover; furthermore; in addition… ... 
In other words; to put it more simply… ... 
Conversely; alternatively; on the contrary; on the other hand… ... 
According to X; X stated that; referring to the views of X… ... 
As well as; along with; coupled with... ... 
Firstly, secondly, thirdly… ... 
In view of; in light of…