Alternative form of if it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck

A subject can be identified by observing its habitual characteristics.

plural of quacksalver

plural of quackery

(nonce word, humorous) comparative form of quack: more quack.

One who quacks. / (slang) A playing card with the rank of two; a duck.

plural of quacker

(transitive, obsolete) To choke. / (intransitive, archaic) To make a quacking sound.

(archaic) One falsely claiming to possess medical or other skills, especially one who dispenses potions, ointments, etc., supposedly having curative powers; a quack.

(law, medicine, uncountable) The practice of fraudulent medicine, usually in order to make money or for ego gratification and power; health fraud.