preserve vs hold on

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

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

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

Other hypernyms of preserve include keep.

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

preserve (noun)	hold on (noun)
fruit preserved by cooking with sugar
a reservation where animals are protected
a domain that seems to be specially reserved for someone

preserve (verb)	hold on (verb)
prevent (food) from rotting	be persistent, refuse to stop
keep in safety and protect from harm, decay, loss, or destruction	stop and wait, as if awaiting further instructions or developments
to keep up and reserve for personal or special use	hold the phone line open
keep or maintain in unaltered condition; cause to remain or last	hold firmly
maintain in safety from injury, harm, or danger	retain possession of
keep undisturbed for personal or private use for hunting, shooting, or fishing