cornflour vs cornstarch

cornflour and cornstarch both are nouns.

Word	Noun	Adjective	Verb	Adverb
cornflour	Yes	No	No	No
cornstarch	Yes	No	No	No

As nouns, cornflour and cornstarch are synonyms defined as:

cornflour and cornstarch: starch prepared from the grains of corn; used in cooking as a thickener

cornflour (noun)	cornstarch (noun)
starch prepared from the grains of corn; used in cooking as a thickener	starch prepared from the grains of corn; used in cooking as a thickener