حروف وأصوات غير موجود في اللغة الإنجليزية
Arabic letters/phonemes not found in the English language

Closest equivalent
ح
pharyngeal h, may be approximated as a whispered hat
خ
Similar to the final sound in the word "loch" as pronounced by the Scottish
Similar to the first sound of the Spanish [...]

ض ظ
Thad and Dhad

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According to a recent @arabicwords_0 Instagram poll, at least 30% of native Arabic speakers find difficulty differentiating between the letters ض and ظ, whether in writing or pronunciation, so [...]