What is the meaning of "Avudah" as opposed to 'Avodah'?
Rashi: 'Avodah' means work (one job); "Avudah Rabah" is many enterprises.
Seforno: "Avudah" means land that is ready to cultivate.
Why does the Torah not mention silver and gold, as it does by Avraham (See Bereishis 13:2)?
Ramban: Because it was regarding sheep and cattle and thriving enterprises that Yitzchak outshone Avimelech and that is what they were jealous of, not his money