Step 1: Clarify “gourmet” vs “gourmand.”
Both relate to eating: a gourmet has refined taste in food, while a gourmand is one who eats excessively. They share the same domain/root with a shift in nuance.
Step 2: Seek a pair with same-root shift.
(D) election (process) vs elector (agent/person). Same root; suffix changes the role. ✓
(A), (B), (C), (E) lack this clear role/process shift. ✗
Step 3: Conclude.
(D) best mirrors the relationship.
\[
\boxed{\text{Option (D)}}
\]