wheat vs wild wheat

wheat and wild wheat both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheat	Yes	No	No	No
wild wheat	Yes	No	No	No

As nouns, wild wheat is a hyponym of wheat; that is, wild wheat is a word with a more specific, narrower meaning than wheat:

wheat: annual or biennial grass having erect flower spikes and light brown grains
wild wheat: found wild in Palestine; held to be prototype of cultivated wheat

wheat (noun)	wild wheat (noun)
a variable yellow tint; dull yellow, often diluted with white	found wild in Palestine; held to be prototype of cultivated wheat
grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour
annual or biennial grass having erect flower spikes and light brown grains