conserve vs retrench

conserve is a noun but retrench is not a noun.

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

As verbs, retrench is a hyponym of conserve; that is, retrench is a word with a more specific, narrower meaning than conserve:

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

conserve (verb)	retrench (verb)
preserve with sugar	make a reduction, as in one's workforce
use cautiously and frugally	tighten one's belt; use resources carefully
keep in safety and protect from harm, decay, loss, or destruction
keep constant through physical or chemical reactions or evolutionary change