By this date there were 35 Puritan churches in and around the Massachusetts Bay Colony. The term was coined by the opponents of Congregationalism, because the non-conformists felt that Henry VIII had not purified the church enough when he founded the Church of England.
The Fire and Ice Website has a very scholarly piece about the spiritual characteristics of the society which grew up from the amalgamation of the original Separatist Pilgrims and the Puritans who began to arrive in their thousands about a decade later.