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: the moon revolving around the Earth causes the phases of the moon. 
Sentence2: Lets start our discussion of the Moon's phases with the New Moon phase.
phases

Sentence1: Mangoes are propagated vegetatively and by seeds. 
Sentence2: animals propagate mangoes.
Mangoes

Sentence1: Most plants have roots . 
Sentence2: most plants have primary and secondary meristems for growth in length and width.

Most