The difference between Shark and Thresher
When used as nouns, shark means a scaleless, predatory fish of the superorder selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head, whereas thresher means anything or anyone that threshes.
Shark is also verb with the meaning: to fish for sharks.
check bellow for the other definitions of Shark and Thresher
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Shark as a noun:
A scaleless, predatory fish of the superorder Selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head.
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Shark as a verb (rare):
To fish for sharks.
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Shark as a noun:
Someone who exploits others, for example by trickery, lies, usury, extortion.
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Shark as a noun (informal, derogatory):
A sleazy and amoral lawyer; an ambulance chaser.
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Shark as a noun (informal):
A relentless and resolute person or group, especially in business.
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Shark as a noun (informal):
A very good poker or pool player. Compare fish (a bad poker player).
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Shark as a noun (sports, and, games):
A person who feigns ineptitude to win money from others.
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Shark as a verb (obsolete):
To steal or obtain through fraud.
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Shark as a verb (obsolete, intransitive):
To play the petty thief; to practice fraud or trickery; to swindle.
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Shark as a verb (obsolete, intransitive):
To live by shifts and stratagems.
Examples:
"rfquotek Beaumont and Fletcher"
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Shark as a verb (obsolete):
To pick or gather indiscriminately or covertly.
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Thresher as a noun (agriculture):
Anything or anyone that threshes.
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Thresher as a noun (agriculture, obsolete):
A now-obsolete hand tool for threshing, also called a flail.
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Thresher as a noun (agriculture):
A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement.
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Thresher as a noun (zoology):
Any of several large pelagic sharks of the genus Alopias, which have a very long tail; more commonly called thresher sharks.