time study vs time and motion study

time study and time and motion study both are nouns.

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

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

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

time study (noun)	time and 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