Minecraft wiki entry for Portal, associated text: Nether portal – The specific formation of obsidian blocks that create the structure used to travel to the Nether.
Nether Portal (block) – The purple, indestructible, transparent, vortex-animated block that fills in a nether portal.
Ruined portal – The naturally-generating formations of obsidian.
Funky Portal — April fools portal, made by throwing a book and quill into a nether portal.
Funky Portal (block) – The indestructible, transparent, vortex-animated block that fills in a funky portal.
End portal – The specific formation of 12 End Portal Frame blocks that create the structure used to travel to the End.
End Portal (block) – The black, indestructible, starry-animated block that fills in an end portal.
End Portal Frame – The indestructible block found in sets of 12 in strongholds that must be activated by inserting an eye of ender.
Exit portal – The exit portal from the End, framed in bedrock.
End gateway – The portal to the outer islands of the End, framed in bedrock.
End Gateway (block) – The full-cube black, indestructible, starry-animated block that fills in an end gateway portal.