Collocations for corn - noun

ripe
green
The corn is still green.

young

ear, sheaf
bag, sack
field

grow
sow
cut, harvest
thresh
grind

grow

field
harvest
mill

field, Indian, sweet (BrE, AmE) (usually sweetcorn in BrE)
biotech, genetically modified (abbreviated to GM), transgenic
non-GM, organic
seed
canned
fresh, frozen
white, yellow
creamed, popped, roasted
caramel, kettle

ear
bushel
field

plant
grow, produce, raise
harvest
grind
eat

grow

field
crop, harvest, yield
cob (usually corncob), husk, kernel, plant, seed, stalk
flour (usually cornflour), meal (usually cornmeal), oil (BrE, AmE), starch (usually cornstarch), syrup (BrE, AmE)
bread, chips, dog, pone, tortilla
grower

corn on the cob (= corn cooked with all the grains still attached)

have, suffer from
treat