Certain dictionary definitions of 'and' in lower-case letters are as a conjunction. In capital letters 'AND' is a noun as a Boolean operator. Below is an example of a request to a sign creator for a sign of symbols for Fish & Chips.

Please give me symbols for: fish, 'fish' and and, '&' and chips, 'chips'.

In that example the word 'and' can be said to appear four times in a row. That first use of 'and' in the example sentence was as a conjunction why was it not a conjunction for the other three uses of the word 'and'? Other Stack Exchange users commented about 'and' as something other than a conjunction. What is 'and' other than a conjunction?

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    Google "and parts of speech" and you get this: **The word “and” is a very common English word, which is almost always used as a conjunction. However, in some cases, the word can also be used as a noun. ** You will find more helpful responses when you display some prior effort on your part. Aug 17 at 13:19
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    The use of all-caps for Boolean operators is a stylistic choice. Aug 17 at 14:15
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    The first time I encountered the "sign maker" problem was to this effect: "There should be more space between fish and and and and and chips", meaning both spaces between the words were too big. You can speak about any word as a word, and then it's a noun. A sign could read "Please do not touch", and the request for the sign would treat each of those words as a noun, even though none of them is.
    – gotube
    Aug 17 at 22:08

and is almost always a conjunction. Really, the answer could stop here.

As @RonaldSole's link demonstrates, a dictionary definition for and may mention that it can also act as a noun or a modifier when referring to the operation in logic or electronics: an AND gate; we combined the three inputs with two ANDs. However, this is a very specialist use.

When @KillingTime said, in a comment on your other question, that and wasn't being used as a conjunction, it had nothing to do with the meaning of the specific word and. Absolutely any word can be used in various ways not found in its dictionary definition. For example:

  1. As a noun, meaning "an instance of the word":

I wrote a sentence with fifteen ands in a row. (Shor may have an algorithm, but I have more ands!)

Often, we would put the word in italics or quotes, but we don't have to.

  1. As an interjection, for emphasis:

You're never satisfied! And, and, and, you always want more.

Note that these possibilities are available for all words, and they have nothing to do with the meaning or part-of-speech of the specific word and:

  1. There are too many talls in this paragraph.

    I think you should delete the angrily in that sentence.

    Should I put a comma after the first the in the name of the band The The?

  2. He said the food was too spicy. Spicy! What does he know about cooking?

    He asked if she was a manager. A! She's THE manager!

In summary: unless you're discussing Boolean logic, and is always a conjunction. But every word in the language can be used in ways not covered by its dictionary definition.

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