a person who communicates by letters.

a person employed by a news agency, periodical, television network, etc., to gather, report, or contribute news, articles, and the like regularly from a distant place.

a person who contributes a letter or letters to a newspaper, magazine, etc.

a person or firm that has regular business relations with another, esp. at a distance.

a thing that corresponds to something else.

consistent, similar, or analogous; corresponding.

noun

contributor , epistler , epistolarian , freelancer , gazetteer , journalist , letter writer , pen pal , reporter , stringer , writer , analogue , congener , correlate , correlative , counterpart , match , conformable , correlation , equivalent , suitable

adjective

accordant , compatible , conformable , congenial , congruous , consistent , consonant , corresponding , harmonious