Primarily vs Chiefly - What's the difference?

In lang=en terms the difference between primarily and chiefly

is that primarily is of a primary or central nature, first and foremost while chiefly is mainly or principally; almost entirely.

of, or relating to a chief.

(-)

(focus) Of a primary or central nature, first and foremost

(en adverb)

(focus) especially or primarily; above all

(focus) mainly or principally; almost entirely

(en adjective)

of, or relating to a chief