tree tomato vs shrub

tree tomato and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree tomato	Yes	No	No	No
shrub	Yes	No	No	No

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

tree tomato: South American arborescent shrub having pale pink blossoms followed by egg-shaped reddish-brown edible fruit somewhat resembling a tomato
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of tree tomato include bush.

tree tomato (noun)	shrub (noun)
South American arborescent shrub having pale pink blossoms followed by egg-shaped reddish-brown edible fruit somewhat resembling a tomato	a low woody perennial plant usually having several major stems