Investigation
Part of speech: noun
Definition: The act of investigating; the process of inquiring into or following up; research; study; inquiry, esp. patient or thorough inquiry or examination; as, the investigations of the philosopher and the mathematician; the investigations of the judge, the moralist.
Example sentence: The teacher's life should have three periods, study until twenty-five, investigation until forty, profession until sixty, at which age I would have him retired on a double allowance.
Probe
Part of speech: verb
Definition: To explore, investigate, or question
Part of speech: noun
Definition: a device, or part of a device, used to explore, investigate or measurean investigation or inquirya move with multiple answers seeking to make the opponent choose and commit to a strategy
Example sentence: How fantastic that the American ingenuity of NASA scientists got us to Mars. It makes me proud to be an American. I can't get enough of these images from when the probe touched down. These scientists are American heroes.