| Why do some words roll off the tongue, whereas others cause breaks in speech?

Question

For example:

Break: ABCDEFGHIJK
Roll-Off: LMNOP

You can say “LMNOP” much faster, because it “rolls off the tongue”. This is the first example I could think of.

Why does this happen?

In: Other

Answer 1

I think it just has to do with enunciation and emphasis.

Kind of like how if you repeat “left, right” or “right left” they sound different even though its the same words and after the first word they are effectively the same sentence.

Another example when I say the alphabet I stop at G, and “HIJKLMNOP” flow together.