ard vs plough

ard and plough both are nouns.

Word	Noun	Adjective	Verb	Adverb
ard	Yes	No	No	No
plough	Yes	No	Yes	No

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

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

Other hypernyms of ard include plow.

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

ard (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