In college I learned that poetry utilizes words to their fullest. Take this poem by William Carlos Williams as an example. Noting that these are not complex words, but they are descriptive and clear.
This Is Just To Say
I have eaten the plums that were in the icebox and which you were probably saving for breakfast Forgive me they were delicious so sweet and so cold
The simplicity of thought and clarity of ideas is the goal. And dictionary.com supports the pursuit.
Here is a sampling of some of the recent word searches I have made to dictionary.com.