Field test and Trial run

Field test noun - A test of the performance of some new product under the conditions in which it will be used.

Trial run and field test are semantically related. In some cases you can use "Trial run" instead a noun phrase "Field test".

Trial run noun - Trying something to find out about it.

Field test and trial run are semantically related. Sometimes you can replace phrase "Field test" with "Trial run", this phrases are similar.