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: Insects have 2 antennae. 
Sentence2: Insects have 2 appendages to detect sound.
2

Sentence1: Sex hormones are chemical messengers that control sexual development and reproduction. 
Sentence2: Androgens are male sex hormones.
Sex

Sentence1: Light is a form of radiant energy. 
Sentence2: a bulb converts electrical energy into radiant energy when turned on.

radiant