What's the difference between" possessive adjective" and" adjectival possessive pronoun"?
Are" possessive adjective" and "adjectival possessive pronoun" the same thing or not? If not, what's the difference between them?

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Answer

Confusing grammar jargon.

possessive adjective = my, your, his, hers, their, etc.  Something needs to follow thee words.

adjectival possessive pronoun = mine, yours, his, hers, theirs etc. Nothing should follow these words because the thing has already been mentioned.