Mirage and Pink elephants

Mirage noun - An optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects.

Pink elephants and mirage are semantically related. In some cases you can use "Pink elephants" instead a noun "Mirage".

Pink elephants noun - Any visual hallucination arising from heavy drinking.

Mirage and pink elephants are semantically related. Sometimes you can use "Mirage" instead a noun phrase "Pink elephants".