Grid Heavy

Place 6-letter words in the grid reading across. Heavy outlines indicate all contiguous cells holding identical letters. Below are clues listed randomly for the five middle words. Can you deduce the top and bottom words which are related? The top and bottom words combined can be used as a promo code for 10% off a puzzle room experience. The code is valid until May 1, 2024.

CLUES: money is legal _______   •   fully grown   •   annoy   •   indefinite academic appointment   •   _______ or worse