Morse and Sea cow

Morse noun - A telegraph code in which letters and numbers are represented by strings of dots and dashes (short and long signals).

Sea cow and morse are semantically related. In some cases you can use "Sea cow" instead a noun "Morse".

Sea cow noun - Any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs.

Morse and sea cow are semantically related. You can use "Morse" instead a noun phrase "Sea cow".