plant hormone vs growth regulator

plant hormone and growth regulator both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant hormone	Yes	No	No	No
growth regulator	Yes	No	No	No

As nouns, plant hormone and growth regulator are synonyms defined as:

plant hormone and growth regulator: (botany) a plant product that acts like a hormone

Other synonyms of plant hormone include phytohormone.

plant hormone (noun)	growth regulator (noun)
(botany) a plant product that acts like a hormone	(botany) a plant product that acts like a hormone