saving vs retrenchment

saving and retrenchment both are nouns.

Word	Noun	Adjective	Verb	Adverb
saving	Yes	Yes	No	No
retrenchment	Yes	No	No	No

As nouns, retrenchment is a hyponym of saving; that is, retrenchment is a word with a more specific, narrower meaning than saving:

saving: an act of economizing; reduction in cost
retrenchment: the reduction of expenditures in order to become financially stable

Other hyponyms of saving include curtailment, downsizing, economy of scale.

saving (noun)	retrenchment (noun)
an act of economizing; reduction in cost	the reduction of expenditures in order to become financially stable
the activity of protecting something from loss or danger	entrenchment consisting of an additional interior fortification to prolong the defense
recovery or preservation from loss or danger

saving (adjective)	retrenchment (adjective)
bringing about salvation or redemption from sin
characterized by thriftiness