#!/bin/bash
function lookup()
{
    case "$1" in
        apple|banana|kiwi|melon)
            echo "FRUIT"
            ;;

        radish|lettuce|potato)  
            echo "VEGETABLE"
            ;;

        blue|red|yellow|green|brown)   
            echo "COLOR"
            ;;
    esac
}

MY_CHOICE="kiwi"
MY_CHOICE_GROUP=$(lookup "$MY_CHOICE")

echo $MY_CHOICE: $MY_CHOICE_GROUP