Three of the following four words are alike in a certain way and one is different Pick the odd word ...........

Explanation:

Except microwave all of the other three options are hardware devices which are mainly used in stationary or office work.while microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiations in the Microwave frequency range.So we can categorize printer scanner and photocopier in one category but microwave is different from all of them hence option 1 is the correct answer.