economise vs conserve

economise is not a noun while conserve is a noun.

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

As verbs, economise and conserve are synonyms defined as:

Other synonyms of economise include economize, husband.

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

economise (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