This is a hard haiku constraint because BROIL carries two strong pulls at once: cooking heat and oppressive weather. In haiku, that can make the last line feel pre-decided unless the poem commits early to one register or cleverly pivots between them. Lari’s “‘Don’t you TREAD on me!’ / Said the BROWN mouse by the BROOM. / Skies begin to BROIL!” is a good example of handling that well: the constraint words are absorbed into a tight little scene, and BROIL expands the poem outward from domestic detail to atmospheric threat. Across the set, the stronger entries give the target word a specific job — grill, climate, aftermath, critique, menace — which is what keeps the prompt from flattening the haiku