hiccup - An involuntary spasm of the diaphragm, resulting in a sudden, brief sound caused by a quick intake of air, often followed by a noticeable "hic" sound.
A girl in the class couldn't stop her hiccups, and the other kids in the class couldn't stop laughing.
injustice - A situation in which the rights of a person or a group are ignored, and they are treated unfairly.
The American Colonies felt that 'taxation without representation' was an injustice that, among other things, warranted a revolutionary war of independence against England.