ضَرَبْتُ ضَرْبًا: a straightforward same-root pattern.
قَعَدْتُ جُلُوسًا: different roots, closely related sitting meaning.
أَنْبَتَ نَبَاتًا: different derived forms, linked by growth meaning.
Semantic compatibility matters; an arbitrary accusative noun is not automatically an absolute object.