Besides, except and apart from
Besides means as well, in addition to.
- Besides the violin, he plays the piano and the flute.
Except, means not including.
- They were all tired except John.
- That was a good essay except for a few spelling mistakes.
Apart from can be used in both senses.
- Apart from the violin, he plays the piano and the flute. (= Besides the violin, ---)
- That was a good essay apart from a few spelling mistakes.
After no, nobody, nothing and similar negative words, the three words can all have the same meaning.
- He has nothing besides/except/apart from his salary
Reference: Practical English Usage By Michael Swan Published by Oxford University Press
Back and Again
Bath and bathe
Beat and win
Because of, due to, owing to and on account of
Before and in front of
Begin and Start
Belong to, belong on and belong in
Below and under
Between and among
Between and during
Between and from
Big, large and great
Born and borne
Bring and take
But, though, in spite of, despite
By and with