Crew is a synonym of herd.
As nouns the difference between crew and herd
is that
crew is a group of people (often staff) manning and operating a large facility or piece of equipment such as a factory, ship, boat, or airplane or
crew can be (british|dialectal) a pen for livestock such as chickens or pigs or
crew can be the manx shearwater while
herd is stove, cooker.
As a verb crew
is to be a member of a vessel's crew or
crew can be (british) (
crow) to have made the characteristic sound of a rooster.