tomato vs tomato plant

tomato and tomato plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
tomato	Yes	No	No	No
tomato plant	Yes	No	No	No

As nouns, tomato and tomato plant are synonyms defined as:

tomato and tomato plant: native to South America; widely cultivated in many varieties

Other synonyms of tomato include love apple, Lycopersicon esculentum.

tomato (noun)	tomato plant (noun)
mildly acid red or yellow pulpy fruit eaten as a vegetable	native to South America; widely cultivated in many varieties
native to South America; widely cultivated in many varieties