interrupt vs hold on

interrupt is a noun but hold on is not a noun.

Word	Noun	Adjective	Verb	Adverb
interrupt	Yes	No	Yes	No
hold on	No	No	Yes	No

As verbs, hold on is a hyponym of interrupt; that is, hold on is a word with a more specific, narrower meaning than interrupt:

Other hyponyms of interrupt include stop, break off, break short, cut short, freeze, suspend.

interrupt (noun)	hold on (noun)
a signal that temporarily stops the execution of a program so that another procedure can be carried out

interrupt (verb)	hold on (verb)
terminate or end	be persistent, refuse to stop
destroy the peace or tranquility of	stop and wait, as if awaiting further instructions or developments
interfere in someone else's activity	hold the phone line open
make a break in	hold firmly
	retain possession of