economize vs conserve

economize is not a noun while conserve is a noun.

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

As verbs, economize and conserve are synonyms defined as:

Other synonyms of economize include economise, husband.

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

economize (verb)	conserve (verb)
use cautiously and frugally	preserve with sugar
spend sparingly, avoid the waste of	use cautiously and frugally
	keep in safety and protect from harm, decay, loss, or destruction
	keep constant through physical or chemical reactions or evolutionary change