gibberellin vs phytohormone

gibberellin and phytohormone both are nouns.

Word	Noun	Adjective	Verb	Adverb
gibberellin	Yes	No	No	No
phytohormone	Yes	No	No	No

As nouns, phytohormone is a hypernym of gibberellin; that is, phytohormone is a word with a broader meaning than gibberellin:

gibberellin: a plant hormone isolated from a fungus; used in promoting plant growth
phytohormone: (botany) a plant product that acts like a hormone

Other hypernyms of gibberellin include growth regulator, plant hormone.

gibberellin (noun)	phytohormone (noun)
a plant hormone isolated from a fungus; used in promoting plant growth	(botany) a plant product that acts like a hormone