Open English Wordnet
Verbs
(v)smother, asphyxiate, suffocatedeprive of oxygen and prevent from breathing“Othello smothered Desdemona with a pillow”, “The child suffocated herself with a plastic bag that the parents had left on the floor”
(v)suffocate, stifle, asphyxiate, chokeimpair the respiration of or obstruct the air passage of“The foul air was slowly suffocating the children”
(v)suffocate, stifle, asphyxiatebe asphyxiated; die from lack of oxygen“The child suffocated under the pillow”