All 16 words, sorted alphabetically. Group them into four categories of four.
The four category names, easiest to hardest. No words revealed yet.
Theme name plus one word from each category.
FOSTER, HARBOR, MAINTAIN, and NURSE all mean to hold onto or keep alive a feeling or emotion, like harboring a grudge or nursing a resentment.
BULL, GREEN, POISON DART, and TREE are all types of frogs, ranging from the common bullfrog to the colorful and deadly poison dart frog.
BENES (Elaine, Seinfeld), BING (Chandler, Friends), LEMON (Liz, 30 Rock), and SCOTT (Michael, The Office) are all surnames of iconic NBC sitcom characters.
FINE PRINT (FINE), GOODBYE (GOO... no — actually GOOD), GREAT WHITE (GREAT), and OKAYAMA (OKAY) each begin with an affirmative response: FINE, GOOD, GREAT, and OKAY.