Eye-witness and Third person

Third person and eye-witness are semantically related. In some cases you can use "Third person" instead a noun phrase "Eye-witness".

Third person noun - Pronouns and verbs that are used to refer to something other than the speaker or addressee of the language in which they occur.

Eye-witness and third person are semantically related. Sometimes you can replace phrase "Eye-witness" with "Third person", this phrases are similar.