cultivated, ploughed/plowed
We had to walk across a ploughed/plowed field.

grass, grassy, green
the green fields of my homeland

muddy, snowy
enclosed
open
neighbouring/neighboring, surrounding
fertile
arable
fallow
irrigated
paddy, rice
corn, wheat, etc.

work in
People were working in the fields.

cultivate, work
Despite the war, they continued to work the fields.

plough/plow, till
plant, sow
He planted fields full of sunflowers.

irrigate
fertilize
clear
graze in

across a/the field, through a/the field
We walked across the field.

(out) in a/the field
tractors working out in the field

field of
a field of wheat

chosen, specialist
All of them are experts in their chosen field.

specialized
research
career (AmE)
burgeoning, emerging
evolving, growing
related
medical
academic

work in
people who work in this field

open up
This discovery has opened up a whole new field of research.

in a/the field
There has been no solid research in this field.

outside a/sb's field
I can't answer that—I'm afraid it's outside my field.

field of
I work in the field of computer science.

an expert in the field, a leader in the field
a field of research, a field of study
in their respective fields
These academics are world leaders in their respective fields.

work in

experiment, investigation, research, study, trial
methods
trip
We went on a geology field trip.

in the field
essential reading for those working in the field

playing, sports
football, rugby, soccer, etc.

take (BrE)
Today they take the field (= go on to the field to play a match) against county champions Essex.

on a/the field
people walking their dogs on the school's playing field

off the field
Players need discipline both on and off the field (= when playing and in other areas of their lives).

strong
crowded
male-dominated

dominate, head, lead
She managed to head the field across the finishing line of the marathon.
They lead the field in home entertainment systems.

enter
leave

include sb
The strong field includes three world record holders.

ahead of the field
His superb technique puts him head and shoulders ahead of the field.

energy, force
electric, electrical, electromagnetic, gravitational, magnetic
the earth's magnetic field

strength

data, display, input

create
You will need to create separate fields for first name, last name and address.

move between
the use of keys to move between fields