I guess you have an ellipsis in mind i.e. a pair of nouns being in such a strong relationship that they are deprived of any articles. We have parallel structures and contrasting structures:
man to man
face to face
from town to town
step by step
husband and wife
mother and child
day and night
town and country
body and soul
from beginning to end
In classical music, a cadenza is a long and technically difficult solo passage in a piece for soloist and orchestra.
It stays between lawyer and client.
We hope this book will act as a bridge between doctor and patient.
The uncommon relationship of Queen Victoria and John Brown was always that of queen and servant only.