wheat vs soft wheat

wheat and soft wheat both are nouns.

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

As nouns, soft wheat is a hyponym of wheat; that is, soft 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
soft wheat: wheat with soft starch kernels used in pastry and breakfast cereals

wheat (noun)	soft wheat (noun)
a variable yellow tint; dull yellow, often diluted with white	wheat with soft starch kernels used in pastry and breakfast cereals
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