If you're thinking of "porter" as someone who carries luggage:
* Passenger: This is the most direct antonym, as a passenger is someone who is being carried or transported, rather than doing the carrying.
* Traveler: A more general term for someone who is moving from one place to another.
* Customer: This is a more general term for someone who uses a service, in this case, the service of a porter.
If you're thinking of "porter" as a type of beer:
* Lager: This is a general term for a type of beer, and many beers that are not porters are lagers.
* Ale: Another general term for a type of beer.
* Stout: While technically similar to a porter, stout is often considered a more intense and flavorful beer.
Other possibilities:
* Delivery person: Someone who delivers goods, rather than carrying luggage.
* Concierge: Someone who provides assistance and services to guests, but may not necessarily carry luggage.
Ultimately, the best antonym for "porter" will depend on the specific context in which you are using the word.