What's the difference between milestone and tilestone?

Milestone

Definition:

(n.) A stone serving the same purpose as a milepost.

Example Sentences:

(1) Criteria examined were birth history, developmental milestones, school history, total number of seizures, neurological examination, and computed tomography (CT) findings.
(2) Although current results, particularly those with neonates, suggest that arterial repair may displace the Mustard operation, it remains a milestone in the history of TGA.
(3) The evolution of treatment of laryngeal cancer has passed a number of milestones.
(4) Kisker that appeared in the 'sixties of the present century are milestones along an important path of panoramic changes in the recent history of psychiatry.
(5) It should be considered that the continued success and achievement of the milestones of health care in Papua New Guinea require close surveillance and support at the basic level.
(6) On the milestone 25th anniversary, Tiananmen is more important than ever.
(7) Tendulkar moved to 95 by driving Paul Harris for six, then edged towards 100, ultimately reaching the milestone in his 175th Test with a single off Dale Steyn.
(8) This model of care treats the general milestones of pregnancy while completely ignoring the patient, making their needs almost invisible to the health system.
(9) "This is a major milestone and testament to the burgeoning reputation of UK automotive excellence and demand for British-made cars."
(10) Milestones in the evolution of the eukaryotic cell are being discovered through the analysis of molecular sequences.
(11) Eddie Howe’s team had decent spells of possession but they could not create anything of clearcut note and Petr Cech reached his heavily signposted milestone as the Premier League’s clean-sheet king without needing to make a serious save.
(12) As a broadcasting milestone, however, the party leaders' election debate was up there with the Coronation and the Speaker's first televised "Order, Order" from the House of Commons.
(13) The first one was characterized by delayed motor milestones, hypotonia and proximal weakness in a 2-year-old girld.
(14) In the second part, quantitation of neural units along key points of the pathways will be presented at milestones in tooth and organism development and aging.
(15) To mark the occasion the country's president, Lee Myung-bak, paid a visit to the site, praising a "huge milestone" for South Korea's engineers, who had helped the country achieve "the dream of independent nuclear technology".
(16) As the child gets older, motor milestones paralleling those of a normal child should be sought with use of a corner chair or sitting device, followed by the use of a standing frame if needed.
(17) Thompson said its sale "represents another milestone in the way the BBC is changing" from a number of broadcasting bases to key HQs in the capital and around the country, including the newly-refurbished Broadcasting House in central London and BBC North in Salford.
(18) A gainst the milestone today of his first 100 days as Labour leader, we are having to reassess the common view of Jeremy Corbyn .
(19) The chancellor, George Osborne, welcomed the news as a “milestone for the British economy” that will ease the pressure on household budgets as he sought to rebuff fears that the UK could be headed towards “damaging deflation”.
(20) This article reviews the major milestones in obstetric research in the past 90 years, which have lead to the wide-spread use of salt restriction during pregnancy.