Morphology is a noun that refers to the study of words and how they form. 

The prefix M-O-R-P-H comes from the Greek word for ‘form.’ In time it came to refer to a change in form. The suffix of our word of the day is O-L-O-G-Y which means ‘the study of.’ So morphology is a study in the forms of words. Example:

I’ve always been fascinated with the way certain words change as they transition from one language to another. In fact, there’s a great book by on morphology that details all these changes in form that many words have undergone.