wheat berry vs grain

wheat berry and grain both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheat berry	Yes	No	No	No
grain	Yes	No	Yes	No

As nouns, grain is a hypernym of wheat berry; that is, grain is a word with a broader meaning than wheat berry:

wheat berry: grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour
grain: foodstuff prepared from the starchy grains of cereal grasses

Other hypernyms of wheat berry include cereal, food grain.

As nouns, grain is a hypernym of wheat berry; that is, grain is a word with a broader meaning than wheat berry:

wheat berry: a grain of wheat
grain: dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn

Other hypernyms of wheat berry include caryopsis.

wheat berry (noun)	grain (noun)
grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour	the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric
a grain of wheat	the physical composition of something (especially with respect to the size and shape of the small constituents of a substance)
	the smallest possible unit of anything
	foodstuff prepared from the starchy grains of cereal grasses
	a relatively small granular particle of a substance
	dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn
	a cereal grass
	1/7000 pound; equals a troy grain or 64.799 milligrams
	1/60 dram; equals an avoirdupois grain or 64.799 milligrams
	a weight unit used for pearls or diamonds: 50 mg or 1/4 carat
	the side of leather from which the hair has been removed

wheat berry (verb)	grain (verb)
	form into grains
	become granular
	thoroughly work in
	paint (a surface) to make it look like stone or wood