phlegm vs phlegmy

phlegm is a noun but phlegmy is not a noun.

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

phlegm (noun)	phlegmy (noun)
inactivity; showing an unusual lack of energy
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

phlegm (adjective)	phlegmy (adjective)
	characterized by phlegm