plow vs scratch plough

plow and scratch plough both are nouns.

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

As nouns, scratch plough is a hyponym of plow; that is, scratch plough is a word with a more specific, narrower meaning than plow:

plow: a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing
scratch plough: a simple light plough without a mouldboard.

Other hyponyms of plow include bull tongue, moldboard plow, mouldboard plough, ard, ard plough.

plow (noun)	scratch plough (noun)
a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing	a simple light plough without a mouldboard.

plow (verb)	scratch plough (verb)
act on verbally or in some form of artistic expression
to break and turn over earth especially with a plow
move in a way resembling that of a plow cutting into or going through the soil