In our daily lives, we often use the phrase "something extra" to refer to a bonus or something additional that is unexpected. However, if you want to add some variety to your vocabulary, here are some synonyms for "something extra" that you can use instead. You can say "a bonus feature," "an added perk," "an additional advantage," "a special treat," "a pleasant surprise," "a little extra something," "a sweetener," "a perk up," "an increment," "an enhancement," or "an extra mile." These synonyms can make your spoken and written communication more engaging and varied, while still conveying the same message of an extra or bonus item.