You searched for: “congregationalists”
Congregationalist (s) (noun), Congregationalists (pl)
A member of the Protestant denomination which has origins in the "Nonconformists" of England: The Congregationalists consider the individual congregation the basic unit of their church and they practice baptism of infants.

"Most Congregationalists in the United States belong to the United Church of Christ."

—From The Dictionary of Cultural Literacy
by E.D. Hirsch, Jr.; Joseph F. Kett, and James Trefil;
Houghton Mifflin Company; Boston; 1988; page 88.
This entry is located in the following units: greg-, -gregate, -gregation (page 1) -ist (page 13)