phytology vs biology

phytology and biology both are nouns.

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

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

Other hypernyms of phytology include biological science.

phytology (noun)	biology (noun)
the branch of biology that studies plants	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms