Farsi · Pronunciation Guide
One syllable: "pahn", with a clearly audible "h" breath in the middle before the final "n" — don't merge it into a simple "pan".
pahn
As a single syllable there's no stress choice to make, but the internal ه must be pronounced as a distinct "h" sound, keeping the word from collapsing into the unrelated word pan.
Listen: پهن
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این جاده پهن است.
In jādde pahn ast.
This road is wide.
Listen: این جاده پهن است.
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"In jādde pahn ast" (This road is wide) again follows the this + noun + adjective + ast pattern; jādde ("road") takes a doubled d in spelling reflecting its Arabic-style root, but it's pronounced as one long, held "d" sound rather than two separate d's.
The biggest trap is skipping the middle ه entirely and saying something closer to English "pan"; that h has to be voiced as a light breath, otherwise pahn ("wide") can be misheard as an entirely different, unrelated syllable.