hold on vs interrupt

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

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

As verbs, interrupt is a hypernym of hold on; that is, interrupt is a word with a broader meaning than hold on:

Other hypernyms of hold on include break.

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

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