Antagonistic Cousin to Tommy and Dil in Rugrats
Puzzle 6 of Common Dreams Hard Pack
Question is: Antagonistic Cousin to Tommy and Dil in Rugrats
and the answer is: ANGELICA
Word Meaning:
ANGELICA — A tall plant, with hollow stems, genus Angelica, especially garden angelica (Angelica archangelica).
Definitions from Wiktionary.