After learning "rajputra" (tatpurush), Kaveri thinks every two-word compound must be tatpurush

Why

Kaveri noticed a surface pattern — two words fused into one — and reasonably assumed it always means the same classification, the same overreach seen with other rules in this chapter. But two compounds can LOOK the same shape (word + word) while working by different internal logic. In 'राजपुत्र' (तत्पुरुष), a dropped case-word links the parts — 'राजा (का) पुत्र'. In 'नीलकमल' (कर्मधारय), one word simply describes a quality of the other — 'नीला (है) कमल'. Test it: try the 'का' insertion test on 'नीलकमल' — 'नीला का कमल' makes no sense, unlike 'राजा का पुत्र', confirming they are different relationships wearing the same two-word shape. Her friend is right: 'नीलकमल' is कर्मधारय समास, describing a quality, while 'राजपुत्र' is तत्पुरुष समास, showing a dropped case-relation — looking similar doesn't mean being the same type.