plow vs bull tongue

plow and bull tongue both are nouns.

Word	Noun	Adjective	Verb	Adverb
plow	Yes	No	Yes	No
bull tongue	Yes	No	No	No

As nouns, bull tongue is a hyponym of plow; that is, bull tongue 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
bull tongue: a heavy plow with a single wide blade; used chiefly in cotton fields

Other hyponyms of plow include moldboard plow, mouldboard plough, ard, ard plough, scratch plough.

plow (noun)	bull tongue (noun)
a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing	a heavy plow with a single wide blade; used chiefly in cotton fields

plow (verb)	bull tongue (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