Frequency: The word is one of the 3000 most common words in English.
1.
Besides something or beside something means in addition to it.
I think she has many good qualities ~ being very beautiful...
There was only one person ~ Ford who knew Julia Jameson.
PREP: oft PREP -ing
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Besides is also an adverb.
You get to sample lots of baked things and take home masses of cookies ~.
ADV: cl ADV
2.
Besides is used to emphasize an additional point that you are making, especially one that you consider to be important.
The house was too expensive and too big. Besides, I’d grown fond of our little rented house.
ADV: ADV with cl, not last in cl