Natural language and Written language

Natural language noun - A human written or spoken language used by a community; opposed to e.g. a computer language.

Written language and natural language are semantically related. in human language topic. In some cases you can use "Written language" instead a noun phrase "Natural language".

Written language noun - Communication by means of written symbols (either printed or handwritten).

Natural language and written language are semantically related. Sometimes you can replace phrase "Natural language" with "Written language", this phrases are similar.