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: Ejaculation allows males to reproduce. 
Sentence2: propelling sperm from the epididymes allows males to reproduce.
allows

Sentence1: nectar is used for attracting pollinators by plants. 
Sentence2: butterflies pollinate plants.
plants

Sentence1: Producers are organisms that produce food for themselves and other organisms. 
Sentence2: trees make food for themselves and other organisms.

food