Illustrated Architecture Dictionary
A roofed shelter attached to the house, with a door to the interior.
Most old-house porches include a balustrade or shingled knee-wall.
Commonly found on Queen Anne and Arts & Crafts styles.
Portico: A roofed entrance porch supported on at least one side by (usually Classical) columns
Loggia: Outdoor corridor or gallery with a fully covered roof and an outer wall that is open to the elements. Traditionally, loggias either ran along the facade of a building or could exist as a stand-alone feature.
Verandah: A roofed platform along the outside of a house, level with the ground floor.
Sleeping porch: A porch or room having open sides or many windows arranged to permit sleeping in the open air.
Examples from Buffalo: