disc plow vs disc plough

disc plow and disc plough both are nouns.

Word	Noun	Adjective	Verb	Adverb
disc plow	Yes	No	No	No
disc plough	Yes	No	No	No

As nouns, disc plow and disc plough are synonyms defined as:

disc plow and disc plough: a plow that consists of a gang of concave steel cutting disks, used for work in hard dry soils.

disc plow (noun)	disc plough (noun)
a plow that consists of a gang of concave steel cutting disks, used for work in hard dry soils.	a plow that consists of a gang of concave steel cutting disks, used for work in hard dry soils.