The amount of words stem from the amount of bits the initial sequence is comprised of, in other words: More words equal a stronger [more secure] sequence, or root key.

https://acrobat.adobe.com/id/urn:aaid:sc:EU:fedfed24-f641-4e74-b754-4377096f6b41

bitcoin_beginners

Is 24 words seed safer than 12 words in terms of bruteforcing the private key

Rsync25

The amount of words stem from the amount of bits the initial sequence is comprised of, in other words: More words equal a stronger [more secure] sequence, or root key.

Have a read: https://acrobat.adobe.com/id/urn:aaid:sc:EU:fedfed24-f641-4e74-b754-4377096f6b41