Plow-Plough | Commonly Confused Words

Plow

/plaʊ/

A tool or machine used to cut, lift, and turn over the soil, especially in preparation for planting crops.

/plaʊ/

A tool or machine used for turning over the soil to prepare for planting crops

Plow and plough are different spellings of the same word; they mean the same thing.
Plow is the preferred spelling in American English.
Plough is the preferred spelling in British English and other varieties of English outside of North America.