electric glow vs arc

electric glow and arc both are nouns.

Word	Noun	Adjective	Verb	Adverb
electric glow	Yes	No	No	No
arc	Yes	No	Yes	No

As nouns, arc is a hypernym of electric glow; that is, arc is a word with a broader meaning than electric glow:

electric glow: an electrical discharge accompanied by ionization of surrounding atmosphere
arc: electrical conduction through a gas in an applied electric field

Other hypernyms of electric glow include discharge, electric arc, electric discharge, spark.

electric glow (noun)	arc (noun)
an electrical discharge accompanied by ionization of surrounding atmosphere	electrical conduction through a gas in an applied electric field
	a continuous portion of a circle
	something curved in shape

electric glow (verb)	arc (verb)
	form an arch or curve