Grammar
Style guide 
than and then
than
Than is used in comparisons.
She is older than him.
Other than that ...
then
Then is used in relation to time or a sequence of events to mean at that time or soon after.
The meeting discussed expenditure, and then broke for lunch.
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Tips include:
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 than
though and although
while or whilst