phytohormone vs growth regulator

phytohormone and growth regulator both are nouns.

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

As nouns, phytohormone and growth regulator are synonyms defined as:

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

Other synonyms of phytohormone include plant hormone.

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