Cases of word usage

1) drawing, design or plan used to explain or illustrate something (diagram)

2) a reason given (true or invented) to explain or defend one's behaviour or actions (excuse)

3) (of writing, speech) used to explain (explanatory)

4) to make (something) clear; help to explain (an idea, fact); to give light to (something) (illuminate)

5) to add pictures, diagrams, photographs etc to (something); to explain (something) by using examples etc (illustrate)

6) used to explain the meaning (of something) (illustrative)

7) something of which the cause or origin is impossible to explain or understand (mystery)

8) a well-known story used long ago to explain natural events, the history of a society or race etc (myth)

9) deduce; explain (parsing)

10) to find the answer to (a problem etc); explain (a difficulty) (solve)