turnaround vs work time

turnaround and work time both are nouns.

Word	Noun	Adjective	Verb	Adverb
turnaround	Yes	No	No	No
work time	Yes	No	No	No

As nouns, work time is a hypernym of turnaround; that is, work time is a word with a broader meaning than turnaround:

turnaround (noun)	work time (noun)
turning in the opposite direction	a time period when you are required to work
act or process of unloading and loading and servicing a vessel or aircraft for a return trip
an area sufficiently large for a vehicle to turn around
a decision to reverse an earlier decision
time need to prepare a vessel or ship for a return trip