Congregational
Part of speech: adjective
Definition: Of or pertaining to a congregation
Congregationalist
Part of speech: adjective
Definition: Of or pertaining to congregationalism
Congregational as an adjective is of or pertaining to a congregation while Congregationalist as an adjective is of or pertaining to congregationalism
Part of speech: adjective
Definition: Of or pertaining to a congregation
Part of speech: adjective
Definition: Of or pertaining to congregationalism
We hope you now know whether to use Congregational or Congregationalist in your sentence.