stagnancy vs doldrums

stagnancy and doldrums both are nouns.

Word	Noun	Adjective	Verb	Adverb
stagnancy	Yes	No	No	No
doldrums	Yes	No	No	No

As nouns, stagnancy and doldrums are synonyms defined as:

Other synonyms of stagnancy include stagnation.

stagnancy (noun)	doldrums (noun)
a state of inactivity (in business or art etc)	a belt of calms and light winds between the northern and southern trade winds of the Atlantic and Pacific
inactivity of liquids; being stagnant; standing still; without current or circulation	a state of inactivity (in business or art etc)