preserve vs maintain

preserve is a noun but maintain is not a noun.

Word	Noun	Adjective	Verb	Adverb
preserve	Yes	No	Yes	No
maintain	No	No	Yes	No

As verbs, preserve and maintain are synonyms defined as:

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

Other synonyms of preserve include conserve, keep up.

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

Other hypernyms of preserve include hold, keep.

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

preserve: keep undisturbed for personal or private use for hunting, shooting, or fishing
maintain: cause to continue in a certain state, position, or activity

Other hypernyms of preserve include hold, keep.

preserve (noun)	maintain (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)	maintain (verb)
prevent (food) from rotting	stick to correctly or closely
keep in safety and protect from harm, decay, loss, or destruction	state categorically
to keep up and reserve for personal or special use	state or assert
keep or maintain in unaltered condition; cause to remain or last	support against an opponent
maintain in safety from injury, harm, or danger	maintain by writing regular records
keep undisturbed for personal or private use for hunting, shooting, or fishing	supply with necessities and support
	keep in safety and protect from harm, decay, loss, or destruction
	have and exercise
	maintain for use and service
	cause to continue in a certain state, position, or activity