palaeobotany vs phytology

palaeobotany and phytology both are nouns.

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

As nouns, phytology is a hypernym of palaeobotany; that is, phytology is a word with a broader meaning than palaeobotany:

Other hypernyms of palaeobotany include botany, palaeobiology, paleobiology.

palaeobotany (noun)	phytology (noun)
the study of fossil plants	the branch of biology that studies plants