Open English Wordnet
Nouns
(n)yawn, yawning, oscitance, oscitancyan involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom“he could not suppress a yawn”,
“the yawning in the audience told him it was time to stop”,
“he apologized for his oscitancy” Verbs
(v)yawnutter a yawn, as from lack of oxygen or when one is tired“The child yawned during the long performance”