garden vs plot of ground

garden and plot of ground both are nouns.

Word	Noun	Adjective	Verb	Adverb
garden	Yes	Yes	Yes	No
plot of ground	Yes	No	No	No

As nouns, plot of ground is a hypernym of garden; that is, plot of ground is a word with a broader meaning than garden:

Other hypernyms of garden include patch, plot, plot of land.

garden (noun)	plot of ground (noun)
a plot of ground where plants are cultivated	a small area of ground covered by specific vegetation
a yard or lawn adjoining a house
the flowers or vegetables or fruits or herbs that are cultivated in a garden

garden (adjective)	plot of ground (adjective)
the usual or familiar type

garden (verb)	plot of ground (verb)
work in the garden