wormhole

As nouns the difference between wormhole and black

is that wormhole is a hole burrowed by a worm while black is the colour/color perceived in the absence of light.

As an adjective black is

absorbing all light and reflecting none; dark and hueless.

As a verb black is

to make black, to blacken.

As a proper noun Black is

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is likely misspelled.

has no English definition.

As a noun wormhole

is a hole burrowed by a worm.

As nouns the difference between portal and wormhole

is that portal is a grandiose and often lavish entrance while wormhole is a hole burrowed by a worm.

As an adjective portal

is of or relating to a porta, especially the porta of the liver.

As nouns the difference between wormhole and ringhole

is that wormhole is a hole burrowed by a worm while ringhole is (physics|astronomy) a relatively short, toroidal wormhole.

As nouns the difference between wormhole and stargate

is that wormhole is a hole burrowed by a worm while stargate is a hypothetical device consisting of a traversable portal (typically a wormhole) that can send one to another location light years away nearly instantaneously.