work time vs face time

work time and face time both are nouns.

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

As nouns, face time is a hyponym of work time; that is, face time is a word with a more specific, narrower meaning than work time:

work time: a time period when you are required to work
face time: work time spent at the location of or in the presence of other people

Other hyponyms of work time include hours, week, workweek, day, overtime, turnaround, turnaround time.

work time (noun)	face time (noun)
a time period when you are required to work	work time spent at the location of or in the presence of other people