botany vs palaeobotany

botany and palaeobotany both are nouns.

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

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

Other hyponyms of botany include mycology, pomology, paleobotany, algology, phycology, pteridology.

botany (noun)	palaeobotany (noun)
the branch of biology that studies plants	the study of fossil plants
all the plant life in a particular region or period