time and motion study vs work study

time and motion study and work study both are nouns.

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

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

time and motion study and work 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 and motion study include motion study, time-and-motion study, time-motion study, time study.

time and motion study (noun)	work 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