Collocations for sphere - noun

wider
He wanted to spread his ideas to a wider sphere than the school.

separate
In the novel, men and women enjoy separate spheres of action.

academic, cultural, domestic, economic, financial, military, political, social
His work is little known outside the academic sphere.

private, public

in sb's/the sphere, within sb's/the sphere
The region is within the Russian sphere of influence.

outside sb's/the sphere
The matter is outside my sphere of responsibility.

sphere of

a sphere of activity
a sphere of influence
a sphere of life