mycology vs botany

mycology and botany both are nouns.

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

As nouns, botany is a hypernym of mycology; that is, botany is a word with a broader meaning than mycology:

mycology: the branch of botany that studies fungi and fungus-caused diseases
botany: the branch of biology that studies plants

Other hypernyms of mycology include phytology.

mycology (noun)	botany (noun)
the branch of botany that studies fungi and fungus-caused diseases	the branch of biology that studies plants
	all the plant life in a particular region or period