Grammar
Style guide 
chair, chairman or chairperson
Many organisations still use chairman for the head of the board. This seems old-fashioned to me and I think better options are chair or chairperson.
Not everyone agrees with me and a few e-newsletter readers have informed me that -man in chairman comes from the Latin manus meaning 'hand'. But how many people know that?
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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
while or whilst