Synonyms for field

a region where a battle is being (or has been) fought (noun)

• battlefield
• battleground

a branch of knowledge (noun)

• discipline
• subject
• study
• bailiwick

the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it (noun)

a particular kind of commercial enterprise (noun)

a particular environment or walk of life (noun)

• sphere
• domain
• area
• orbit
• arena

a piece of land prepared for playing a game (noun)

extensive tract of level open land (noun)

• plain
• champaign

a region in which active military operations are in progress (noun)

• theater
• theatre

the area that is visible (as through an optical instrument) (noun)

a place where planes take off and land (noun)

• airfield