jackaroo

As a noun jackaroo

is (australia|queensland|obsolete) a white man living outside white settlement.

As a verb jackaroo

is to work as a jackaroo.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between stockmen and jackaroo

is that stockmen is while jackaroo is (australia|queensland|obsolete) a white man living outside white settlement.

As a verb jackaroo is

to work as a jackaroo.

In intransitive terms the difference between jackaroo and cowboy

is that jackaroo is to work as a jackaroo while cowboy is to work as a cowboy, herding cattle.