Grammar
Style guide 
while or whilst?
Most writers choose either while or whilst, depending on their personal preference. However some experts believe there are subtle differences between while and whilst.
while
Some grammar experts believe while should be used in relation to time
.
The news came on while we were eating dinner.
whilst
Some grammar experts believe whilst should be used when the meaning is ‘although’.
Whilst she is new to the area, she has quickly made friends.
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but and however
complement and compliment
different from, different than or different to
disinterested and uninterested
fewer and less
persons or people?
proportional or proportionate
round and around
than and then
though and although