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.
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Question: Sentence1: the ovaries are used in reproduction.
Sentence2: Unlike most female animals, which have two functioning ovaries, the chicken usually has only one.

Answer: ovaries

Question: Sentence1: Contact with infected blood, contaminated needles.
Sentence2: scraping oneself on an infected needle may cause infection.

Answer: infected

Question: Sentence1: Chromoplasts make and store pigments.
Sentence2: Photosynthesis Pigments Pigments are substances that absorb visible light.

Answer:
pigments