TASK DEFINITION: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
PROBLEM: Sentence1: If the skin is painful, seek medical attention. 
Sentence2: If your skin hurts, your touch receptors will sense differences.

SOLUTION: skin

PROBLEM: Sentence1: Many plants respond to the days growing shorter in the fall by going dormant. 
Sentence2: Many plants respond to the autumnal equinox by going dormant.

SOLUTION: Many

PROBLEM: Sentence1: Sense of smell is the ability to detect odors. 
Sentence2: Better ability to detect odors has a positive impact on an animal's survival.

SOLUTION:
ability