plant food vs fertiliser

plant food and fertiliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant food	Yes	No	No	No
fertiliser	Yes	No	No	No

As nouns, plant food and fertiliser are synonyms defined as:

plant food and fertiliser: any substance such as manure or a mixture of nitrates used to make soil more fertile

Other synonyms of plant food include fertilizer.

plant food (noun)	fertiliser (noun)
any substance such as manure or a mixture of nitrates used to make soil more fertile	any substance such as manure or a mixture of nitrates used to make soil more fertile