tree cotton vs cotton plant

tree cotton and cotton plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree cotton	Yes	No	No	No
cotton plant	Yes	No	No	No

As nouns, cotton plant is a hypernym of tree cotton; that is, cotton plant is a word with a broader meaning than tree cotton:

tree cotton: East Indian shrub cultivated especially for ornament for its pale yellow to deep purple blossoms
cotton plant: erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers

Other hypernyms of tree cotton include cotton.

As nouns, cotton plant is a hypernym of tree cotton; that is, cotton plant is a word with a broader meaning than tree cotton:

tree cotton: small bushy tree grown on islands of the Caribbean and off the Atlantic coast of the southern United States; yields cotton with unusually long silky fibers
cotton plant: erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers

Other hypernyms of tree cotton include cotton.

tree cotton (noun)	cotton plant (noun)
East Indian shrub cultivated especially for ornament for its pale yellow to deep purple blossoms	erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers
small bushy tree grown on islands of the Caribbean and off the Atlantic coast of the southern United States; yields cotton with unusually long silky fibers