I was shocked to learn that they didn't know what the word "stewardship" meant; just had not seemed to have heard the word before.
That is odd. I happen to have a Greek/English, inter-linear--New Testament, which was published by the JW's in 1942. I can read Greek, slowly. The Greek for 'steward' is OIKONOMON--sounds like our English word, economics.

It literally means 'the manager of house and property. The JW NT does use 'steward' (Luke 16)--from English: keeper (warden) of the animal stys.
G~O~D--Now & ForeverIS:Nature, Nurture & PNEUMA-ture, Thanks to Warren Farr&ME AT www.unitheist.org