botany vs ground cover

botany and ground cover both are nouns.

Word	Noun	Adjective	Verb	Adverb
botany	Yes	No	No	No
ground cover	Yes	No	No	No

As nouns, ground cover is a hyponym of botany; that is, ground cover is a word with a more specific, narrower meaning than botany:

botany: all the plant life in a particular region or period
ground cover: low-growing plants planted in deep shade or on a steep slope where turf is difficult to grow

botany (noun)	ground cover (noun)
the branch of biology that studies plants	small plants other than saplings growing on a forest floor
all the plant life in a particular region or period	low-growing plants planted in deep shade or on a steep slope where turf is difficult to grow