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-motion study, time and 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