IPA: /ˌɑːbəˈriːtəm/
KK: /ˌɑːrbəˈriːtəm/
A location where many types of trees and plants are grown for study, education, and decoration.
The arboretum is a beautiful place to learn about different species of trees.
Arboretum is formed from "arbor" (from Latin, meaning tree) and "-etum" (a suffix used in Latin to denote a place associated with a specific thing). The word "arboretum" refers to a place where trees are cultivated for study and display.
Think of 'arbor' meaning tree, and '-etum' indicating a place — an arboretum is a place for trees.
No commonly confused words.