Question

Juror is to jury as

entertainer is to troupe.
senator is to lobbyist.
football is to helmet.
dirt is to earthworm.

Answer 1

a Juror is a part of a jury

Answer 2

So what you need to do is find what is a part of what. ( Entertainer is part of a troupe)

Answer 3

senator is not a lobbyist, for they need them

Answer 4

football is a game that involves a helmet

Answer 5

and dirt is needed by the earthworm