botany vs brier

botany and brier both are nouns.

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

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

botany (noun)	brier (noun)
the branch of biology that studies plants	evergreen treelike Mediterranean shrub having fragrant white flowers in large terminal panicles and hard woody roots used to make tobacco pipes
all the plant life in a particular region or period	a very prickly woody vine of the eastern United States growing in tangled masses having tough round stems with shiny leathery leaves and small greenish flowers followed by clusters of inedible shiny black berries
	Eurasian rose with prickly stems and fragrant leaves and bright pink flowers followed by scarlet hips
	tangled mass of prickly plants
	a thorny stem or twig