I already knew what Botany was before today, but this next derivative word was a new one for me, so I had to look it up.

BOTANY as a noun, means the scientific study of plants, including their physiology, structure, genetics, ecology, distribution, classification, and economic importance. An example of the proper use of this word would be "I want to study the science of botany because I am interested in the chemistry of plants."

ETHNOBOTANY as a noun, means the scientific study of the traditional knowledge and customs of a people concerning plants and their medical, religious, and other uses. An example of the proper use of this word would be "I want to include ethnobotany in the school's curriculum because many students are interested in how the Native Americans used plants in their religious rituals."