double-furrow plough vs double-furrow plow

double-furrow plough and double-furrow plow both are nouns.

Word	Noun	Adjective	Verb	Adverb
double-furrow plough	Yes	No	No	No
double-furrow plow	Yes	No	No	No

As nouns, double-furrow plough and double-furrow plow are synonyms defined as:

double-furrow plough and double-furrow plow: a plough with two moldboards.

Other synonyms of double-furrow plough include two-furrow plough, two-furrow plow.

double-furrow plough (noun)	double-furrow plow (noun)
a plough with two moldboards.	a plough with two moldboards.