The term PART OF WPM is composed of three crossword solutions: PER (3 letters), MIN (3 letters), and WDS (3 letters). PER stands for 'PERIODS' and is a unit of measurement used to measure the speed of typing. MIN stands for 'MINUTES' and is a unit of time measurement. WDS stands for 'WORDS' and is a unit of measurement used to measure the amount of WORDS typed in a given period of time. Together, these three terms form the acronym WPM, which stands for 'WORDS PER Minute' and is a measure of typing speed.