The beach, at dusk, was extremely sandy.
My aunt had a cat that was named Sandy.
Mom, I'm going to my bed for a rest.
A one syllable word has only one syllable. A ten syllable word has ten. There are no one syllable words with ten syllables.
one syllable
That's not a thing. But a ten-syllable word might be considered decasyllabic.
Ten
the ten part
The accented syllable in the word "pretend" is the second syllable, pronounced "ten."
for got ten
of-ten
ten-syllable line
The accent in the word "tender" is on the first syllable, "ten." This means that this syllable is emphasized when pronouncing the word.
The word tender is accented on the first syllable. (ten-der)