moldboard plow vs plough

moldboard plow and plough both are nouns.

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

As nouns, plough is a hypernym of moldboard plow; that is, plough is a word with a broader meaning than moldboard plow:

moldboard plow: plow that has a moldboard
plough: a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing

Other hypernyms of moldboard plow include plow.

moldboard plow (noun)	plough (noun)
plow that has a moldboard	a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing

moldboard plow (verb)	plough (verb)
	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