One-word sentences are acceptable, especially when used as retorts or responses in conversation.

He used his outstanding ability of countering the questions directed at him with witty retorts, as was his speciality.

When Benvolio says "... Dexterity retorts it..." he means that Tybalt is quick with his swordsmanship that he has a quick move against Mercutio

An alembic is an early piece of chemical apparatus consisting of two retorts connected by a tube, used to purify substances by distillation.

"Indeed some of the retorts made by government officials whenever this topic is brokered appear to be purely a tactic of obfuscation!"

His retort went unanswered.