botany vs pomology

botany and pomology both are nouns.

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

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

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

botany (noun)	pomology (noun)
the branch of biology that studies plants	the branch of botany that studies and cultivates fruits
all the plant life in a particular region or period