Comet is a closed syllable juncture.
open syllable juncture
It is an open syllable.
Freedom has a closed syllable juncture because the syllable "dom" ends in a consonant sound (m).
human is a closed syllable word
Photo is an open syllable word.
First syllable closed, second syllable open.
Closed
Closed
The second syllable is open, the first is closed.
Paper is a closed syllable word.
Both open syllables.
Both closed.