ballast resistor vs resistor

ballast resistor and resistor both are nouns.

Word	Noun	Adjective	Verb	Adverb
ballast resistor	Yes	No	No	No
resistor	Yes	No	No	No

As nouns, resistor is a hypernym of ballast resistor; that is, resistor is a word with a broader meaning than ballast resistor:

ballast resistor: a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
resistor: an electrical device that resists the flow of electrical current

Other hypernyms of ballast resistor include resistance.

ballast resistor (noun)	resistor (noun)
a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)	an electrical device that resists the flow of electrical current