growth regulator vs plant hormone

growth regulator and plant hormone both are nouns.

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

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

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

Other synonyms of growth regulator include phytohormone.

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