quack

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Related to quacky: quirky

if it looks like a duck and walks like a duck, it is a duck

If something has all the characteristics of a thing, it is probably that thing, regardless of what it is called or presented as. There are many variations of the expression, and it is often shortened to the first part of the phrase. They say it's not a tax, but if it looks like a duck and walks like a duck, it is a duck.
See also: and, duck, if, like, look, walk

quack

n. a fraudulent physician; a derogatory term for a physician. I won’t go back to that quack ever again!
References in periodicals archive ?
We, at GAME, created Giant Quacky to travel to locations holding record-setting Derby Duck Races.
MARATHON MEN: Armagh's Sam, Mark and Matthew Nicholson; QUACKY RACES: Ducking out
Stupid quacky things that can swim faster than me and then just as I am finally about to catch one, they fly away.
The Quacky race will raise thousands of pounds for charity, including WaterAid and the city's St Cuthbert's Hospice as well as helping to light up Durham City this festive season.
Quacky made his debut on the Ohio River today (65 feet and 1100 pounds).
Leaping onto the screen from the pages of Jones' witty stylings, the film teaches about the lawmaking process and three branches of government, as illustrated by Daffy's quacky quest: become President of the United States, then declare year-round Rabbit Season