What's the difference between dub and dubb?

Dub

Definition:

(v. t.) To confer knighthood upon; as, the king dubbed his son Henry a knight.
(v. t.) To invest with any dignity or new character; to entitle; to call.
(v. t.) To clothe or invest; to ornament; to adorn.
(v. t.) To strike, rub, or dress smooth; to dab;
(v. t.) To dress with an adz; as, to dub a stick of timber smooth.
(v. t.) To strike cloth with teasels to raise a nap.
(v. t.) To rub or dress with grease, as leather in the process of cyrrying it.
(v. t.) To prepare for fighting, as a gamecock, by trimming the hackles and cutting off the comb and wattles.
(v. i.) To make a noise by brisk drumbeats.
(n.) A blow.
(n.) A pool or puddle.

Example Sentences:

(1) Among the guests invited to witness the flypast were six second world war RAF pilots, dubbed the “few” by the wartime prime minister, Winston Churchill.
(2) Last week at a press conference Putin defended the legislation as an appropriate response to the Magnitsky Act, which he dubbed an "anti-Russian" law.
(3) The Kremlin's initial reaction to stories dubbing Russia a corrupt "mafia state" and kleptocracy was, predictably, negative.
(4) The new development, which the Californian technology giant dubs "real-time search", aims to bring users more up-to-date information as they scour the web for information.
(5) Dubbed France's MP for London, Lemaire represents one of the largest populations of French nationals outside France .
(6) DUB diagnosis requires careful exclusion of organic pathology through a detailed history, complete physical examination, and a complete blood count.
(7) In 2014, they seized on Osborne’s declaration of a “northern powerhouse” to promote One North, a plan for a £15bn network, dubbed HS3, between Lancashire and Yorkshire.
(8) How can this generously dubbed "elite" guarantee the future of the nation?
(9) Kevin Rudd's election campaign in 2007 was dubbed "hurry up and wait" by some wags.
(10) Alternatively, the politicians could be raising suspicions without evidence to weaken the incoming president, Donald Trump, whom his former opponent Hillary Clinton dubbed a “puppet” of the Russians.
(11) The prime minister will announce that £400m from dormant bank accounts will be used to help finance the scheme, dubbed Big Society Capital.
(12) Calais's youths: the unaccompanied minors left in political limbo Read more Dubs, who was saved from the Nazis and brought to London in 1939 as part of the Kindertransport programme, has led a parliamentary campaign to take in youngsters from camps near Calais and elsewhere in Europe who, he says, are hugely vulnerable to exploitation, sexual violence and disease.
(13) The incident – dubbed by protesters the “137”, after the number of shots that were fired at the victims’ car – became a cause célèbre.
(14) Some within the party have dubbed it the government's "poll tax", the policy that proved so damaging to Margaret Thatcher's last government.
(15) Last year David Cameron dubbed Offa’s Dyke “the line between life and death”, and barely a week goes by at Westminster without the Conservatives kicking the Welsh NHS.
(16) This was dubbed a "death tax" by the Tories, prompting the collapse of all-party talks.
(17) The proposals had prompted an outcry among Tory backbenchers and were dubbed a "conservatory tax".
(18) He suggested that the intelligence agencies were suffering because of the failure, largely due to Liberal Democrat opposition, to give them more powers in what is dubbed a “snoopers’ charter”.
(19) Tian Tian, the female, whose name means sweetie, and Yang Guang, meaning sunlight, travelled from China on board a Boeing 777F flight dubbed the FedEx Panda Express, with a vet and two animal handlers.
(20) But it may not have been coincidence that two months later, Farage was being feted by Murdoch’s the Times, which dubbed the controversial leader “Man of the Moment” .