ढ is palatal constant, it come in group of ट ठ ड ढ ण | Palatal consonants are consonants articulated with the body of the tongue raised against the hard palate (the middle part of the roof of the mouth)
ढाल
ढोल
ढाई
ढूँढ़ना
ढेर
द is a dental constant it comes in group of त थ द ध न | A dental consonant is a consonant articulated with the tongue against the upper teeth
दंड
दंग
दंगा
दगाबाज
दध
ड is palatal constant, it come in group of ट ठ ड ढ ण | Palatal consonants are consonants articulated with the body of the tongue raised against the hard palate (the middle part of the roof of the mouth)
डांट
डाक्टर
डाबर
डालना
डिबिया
ड़ ढ़ ( not in your question ) are mixed consonants. which has been produced from ड ढ ( palatals consonants). In which some hhhhh sound comes from throat and tongue tremble. No word start with some Hindi alphabets ( अः, ङ , ञ, ण, ढ़, ड़ )
कड़क
अकड़
पकड़
जकड़
श ष स are sibilant, in phonetics, a fricative consonant sound, in which the tip, or blade, of the tongue is brought near the roof of the mouth and air is pushed past the tongue to make a hissing sound
दोष
निर्दोष
षडयंत्र
षष्ठी
षट्कोण
षोडशी
I hope it will be helpful for you.
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