2, 3, 5.
examination. T rial , experiment , test imply an attempt to find out something or to find out about something. T rial is the general word for a trying of anything: articles sent for ten days' free trial.
E xperiment is a trial conducted to prove or illustrate the truth or validity of something, or an attempt to discover something new: an experiment in organic chemistry.
T est is a more specific word, referring to a trial under approved and fixed conditions, or a final and decisive trial as a conclusion of past experiments: a test of a new type of airplane. 4.
endeavor, essay, struggle. 7.
grief, tribulation, distress, sorrow, trouble, hardship. See affliction