A-side 
noun
The side of a pop single regarded as the main one.The double A-side single Young Man is currently out on promo....
- I wanted to make an album that didn't have any throw away tracks on it… where every piece is a potential A-side single.
- I also like the idea of recording songs in pairs and putting them out as double A-sides.
- administratress
- administratrix
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- admirability
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- admirableness
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- admiral
- admiral court
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- Admiral of the Fleet
- Admiral's Cup
- admiralship
- admiral's mast
- Admiralty
- Admiralty Board
- Admiralty brass
- Admiralty court