#!/bin/bash
declare -A groups

groups["apple"]="FRUIT"
groups["banana"]="FRUIT"
groups["kiwi"]="FRUIT"
groups["melon"]="FRUIT"

groups["radish"]="VEGETABLE"
groups["lettuce"]="VEGETABLE"
groups["potato"]="VEGETABLE"

groups["blue"]="COLOR"
groups["red"]="COLOR"
groups["yellow"]="COLOR"
groups["green"]="COLOR"
groups["brown"]="COLOR"

MY_CHOICE="kiwi"
MY_CHOICE_GROUP=${groups[$MY_CHOICE]}

echo $MY_CHOICE: $MY_CHOICE_GROUP