δοκίμιον/dokimion

The word is a type of thing or idea. It is a noun.

This word means a test or testing. This word is used to talk about the testing of something to prove if something is good quality or reliable.
This word can mean genuineness. This word is used to talk about something that has been proven to be genuine by enduring a test or trial.

See: James 1:3; 1 Peter 1:7