botany vs phytology

botany and phytology both are nouns.

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

As nouns, botany and phytology are synonyms defined as:

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