gibberellin vs plant hormone

gibberellin and plant hormone both are nouns.

Word	Noun	Adjective	Verb	Adverb
gibberellin	Yes	No	No	No
plant hormone	Yes	No	No	No

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

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

Other hypernyms of gibberellin include growth regulator, phytohormone.

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