cornstarch vs cornflour

cornstarch and cornflour both are nouns.

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

As nouns, cornstarch and cornflour are synonyms defined as:

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

cornstarch (noun)	cornflour (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