wheat vs bulgur

wheat and bulgur both are nouns.

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

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

wheat: grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour
bulgur: parched crushed wheat

Other hyponyms of wheat include bulghur, bulgur wheat, cracked wheat.

wheat (noun)	bulgur (noun)
a variable yellow tint; dull yellow, often diluted with white	parched crushed 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