Collocations for employer - noun

big, large, major, top
one of the region's major employers

small
local
corporate, private
government, public
civilian
good
The hotel prides itself on being a good employer that treats its staff well.

unscrupulous (esp. BrE)
the use of illegal workers by unscrupulous employers

equal-opportunities (BrE), equal-opportunity (AmE)
future, potential, prospective
current
former, previous

have, work for
sue
He sued his employer for personal injuries.

force, require
The action forced the employers to improve their pay offer.

sanctions (AmE)
employer sanctions that penalize employers who hired unauthorized workers

contributions
employer contributions to pension plans