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A mailbox is something humans have outside their houses. Other humans put paper in them. Humans with exceptional taste make their mailboxes look like cats.
Tastes bad. Best to be avoided.
It can mean anything you want it to mean. The humans can figure it out for themselves.
A mermaid is a half-human, half fish. Note half HUMAN. There is no such thing as a mer-cat, no matter how hard humans try.
Mirrors are strange. Whenever you look at them up close, there is always another cat there, looking back at you.
Cats do not care so much for facial symmetry as do humans.
A slightly knobbly warm surface to sleep on.
"I'd like to order a sardine and anchovy pizza please."
Motherboards come in boxes that are clearly designed to be the right size for cats to sleep in. Purveyors of fine computer components are so thoughtful in this regard.
Mugs sometimes contain drinks that are quite tasty. They are just the right size to fit a cat’s head into.
Mulch covers the ground, keeps the soil moist and makes it much easier for cats to camouflage in human backyards.
A very odd looking, inedible plant. Also sometimes copied by humans as chimneys.