Tonic.
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An Australian dog that is also a five-letter word is a Dingo.
A comby tie is also called a bolo.
It is a word, an article to be exact. It is also a letter, you can only use it alone as a word.
It is called a "letter manipulation" or a "word transformation."
When something on Broadway is a bomb, it can also be called a flop.
A river source is also called a "rise"
A silent letter in a word is called a "mute letter" or a "silent consonant." These are letters in a word that are not pronounced when speaking the word, but are still included when writing it.
The first letter of a word is the initial.
no but there is a 1253 letter word called titin
It's called an acronym (such as FBI, NASA or USA) when the first letter or letters of some words are used.These may also be called "initialisms" including D.A. (district attorney) or BBC.
I believe it is called a backronym. acronymThe word you're looking for might also be mnemonic.