“Grind”
hello
August is AU-gust, two syllables
i said hello
how are u?
Strength
i challenged u
not u
waaa?
In Swedish there is a length measurement, mil, that is 10km long...
If you accept an abbreviation I've seen ly for lightyear...
But I believe you mean one syllable word with most letters? Perhaps a Welsh or Finnish word would win.
A
Pat on the back