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.

Sentence1: cell division often causes growth. 
Sentence2: Cell division leads to reproduction.
cell

Sentence1: Blood type is important for medical reasons. 
Sentence2: Type O is important for medical reasons.
important

Sentence1: Lifting objects from the floor can hurt. 
Sentence2: pulleys can prevent humans from getting hurt.

hurt