sputum

As a letter s

is the letter s with a.

As a noun sputum is

(physiology) matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus.

As nouns the difference between sputum and cough

is that sputum is matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus while cough is a sudden, usually noisy expulsion of air from the lungs, often involuntary.

As a verb cough is

to push air from the lungs in a quick, noisy explosion.

As nouns the difference between sputum and spittoon

is that sputum is (physiology) matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus while spittoon is a receptacle for spit.

As nouns the difference between sputum and spitoon

is that sputum is (physiology) matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus while spitoon is .

As nouns the difference between sputum and expectoration

is that sputum is matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus while expectoration is the action of expectorating, of ejecting phlegm or mucus from the throat or lungs by coughing, hawking, or spitting.

Plegm is likely misspelled.

Plegm has no English definition.

As a noun sputum

is matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus.

As nouns the difference between spetum and sputum

is that spetum is a medieval long spear with two sharp tapering blades projecting forward at 45 degrees with the blunt side facing the opponent while sputum is matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus.

As nouns the difference between scutum and sputum

is that scutum is an oblong shield made of boards or wickerwork covered with leather, with sometimes an iron rim; carried chiefly by the heavy-armed infantry of the Roman army while sputum is matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus.

As a proper noun Scutum

is a small autumn constellation of the northern sky, said to resemble a shield. It lies between the constellations of Aquila, Sagittarius, and the tail of Serpens.

As nouns the difference between taxonomy and sputum

is that taxonomy is the science or the technique used to make a classification while sputum is (physiology) matter coughed up and expectorated from the mouth, composed of saliva and discharges from the respiratory passages such as mucus, phlegm or pus.