shrubbery vs shrub

shrubbery and shrub both are nouns.

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

shrubbery (noun)	shrub (noun)
a collection of shrubs growing together	a low woody perennial plant usually having several major stems
an area where a number of shrubs are planted