stolidity vs phlegm

stolidity and phlegm both are nouns.

Word	Noun	Adjective	Verb	Adverb
stolidity	Yes	No	No	No
phlegm	Yes	No	No	No

As nouns, stolidity and phlegm are synonyms defined as:

stolidity and phlegm: apathy demonstrated by an absence of emotional reactions

Other synonyms of stolidity include emotionlessness, impassiveness, impassivity, indifference, unemotionality.

stolidity (noun)	phlegm (noun)
an indifference to pleasure or pain	inactivity; showing an unusual lack of energy
apathy demonstrated by an absence of emotional reactions	expectorated matter; saliva mixed with discharges from the respiratory passages; in ancient and medieval physiology it was believed to cause sluggishness
	apathy demonstrated by an absence of emotional reactions