What is the acronym for eight parts of speech?

There isn't a standard acronym for all eight parts of speech. This is because some sources only list eight parts of speech while others list nine or even more.

However, you can create your own acronym using the first letters of the most commonly recognized eight parts of speech:

Noun

Pronoun

Verb

Adjective

Adverb

Preposition

Conjunction

Interjection

This could be "NAVAAPCI".

Remember, the best way to remember parts of speech is to understand their function in a sentence and practice identifying them.