preserve vs keep up

preserve is a noun but keep up is not a noun.

Word	Noun	Adjective	Verb	Adverb
preserve	Yes	No	Yes	No
keep up	No	No	Yes	No

As verbs, preserve and keep up are synonyms defined as:

preserve and keep up: keep in safety and protect from harm, decay, loss, or destruction

Other synonyms of preserve include conserve, maintain.

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

preserve (noun)	keep up (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)	keep up (verb)
prevent (food) from rotting	prevent from going to bed at night
keep in safety and protect from harm, decay, loss, or destruction	keep informed
to keep up and reserve for personal or special use	maintain a required pace or level
keep or maintain in unaltered condition; cause to remain or last	keep in safety and protect from harm, decay, loss, or destruction
maintain in safety from injury, harm, or danger	lengthen or extend in duration or space
keep undisturbed for personal or private use for hunting, shooting, or fishing