conductor vs busbar

conductor and busbar both are nouns.

Word	Noun	Adjective	Verb	Adverb
conductor	Yes	No	No	No
busbar	Yes	No	No	No

As nouns, busbar is a hyponym of conductor; that is, busbar is a word with a more specific, narrower meaning than conductor:

conductor: a device designed to transmit electricity, heat, etc.
busbar: an electrical conductor that makes a common connection between several circuits

conductor (noun)	busbar (noun)
a device designed to transmit electricity, heat, etc.	an electrical conductor that makes a common connection between several circuits
the person who leads a musical group
the person who collects fares on a public conveyance
a substance that readily conducts e.g. electricity and heat