conserve vs maintain

conserve is a noun but maintain is not a noun.

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

As verbs, conserve and maintain are synonyms defined as:

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

Other synonyms of conserve include keep up, preserve.

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

conserve: keep constant through physical or chemical reactions or evolutionary change
maintain: cause to continue in a certain state, position, or activity

Other hypernyms of conserve include hold, keep.

conserve (noun)	maintain (noun)
fruit preserved by cooking with sugar

conserve (verb)	maintain (verb)
preserve with sugar	stick to correctly or closely
use cautiously and frugally	state categorically
keep in safety and protect from harm, decay, loss, or destruction	state or assert
keep constant through physical or chemical reactions or evolutionary change	support against an opponent
	maintain by writing regular records
	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