extra (adj)

If you need any extra help, just call me.
Recently he's been working an extra two hours a day.
The price includes travel and accommodation but meals are extra (= there is an additional charge for meals).
She ordered extra cheese on her pizza for an indulgent treat.
The hotel provided extra amenities, such as complimentary toiletries and a welcome basket.
He earned some extra income by taking on freelance projects in addition to his full-time job.
The airline charged an extra fee for passengers who wanted to check in additional luggage.