botany vs shrubbery

botany and shrubbery both are nouns.

Word	Noun	Adjective	Verb	Adverb
botany	Yes	No	No	No
shrubbery	Yes	No	No	No

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

botany (noun)	shrubbery (noun)
the branch of biology that studies plants	a collection of shrubs growing together
all the plant life in a particular region or period	an area where a number of shrubs are planted