Scientific words
Diurnal as opposite to nocturnal
Osseous - bony
Anemometer - instrument for measuring wind
These words are rarely used.
Navvy - close to the word Navy, unskilled manual laborer, in the
past seamen.
Philately - stamp collector
There are many words in the dictionary. And they are uncommonly
used. Since nobody is using it anyway. There is no point in
learning, because to achieve the purpose of communication, the
other party must also understand what you are trying to say.
Redundant.
