veg vs pieplant

veg and pieplant both are nouns.

Word	Noun	Adjective	Verb	Adverb
veg	Yes	No	No	No
pieplant	Yes	No	No	No

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

veg: edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant
pieplant: long pinkish sour leafstalks usually eaten cooked and sweetened

veg (noun)	pieplant (noun)
edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant	long pinkish sour leafstalks usually eaten cooked and sweetened