Communications & Public Relations which one includes the other one?

Healthy communication builds trust and strong relations.

Trust and good relations build the PR strong.

So, PR needs communication strong.

Means PR included good communication in it.

Corporate communications is a much broader field including public relations and stakeholder engagement. 

Public Relations includes communication,you can not go in front of a group of people representing your company if you have low communication skills. But you can be a communicative person with no any knowledge in PR or public speaking.

Public relations involves two-way communication plus action

in view both are the complrmentry to each other.

but communication is the include other one