gibberellin vs growth regulator

gibberellin and growth regulator both are nouns.

Word	Noun	Adjective	Verb	Adverb
gibberellin	Yes	No	No	No
growth regulator	Yes	No	No	No

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

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

Other hypernyms of gibberellin include phytohormone, plant hormone.

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