time study vs motion study

time study and motion study both are nouns.

Word	Noun	Adjective	Verb	Adverb
time study	Yes	No	No	No
motion study	Yes	No	No	No

As nouns, time study and motion study are synonyms defined as:

time study and motion study: an analysis of a specific job in an effort to find the most efficient method in terms of time and effort

Other synonyms of time study include time-and-motion study, time-motion study, time and motion study, work study.

time study (noun)	motion study (noun)
an analysis of a specific job in an effort to find the most efficient method in terms of time and effort	an analysis of a specific job in an effort to find the most efficient method in terms of time and effort