Reindeer relative is a term used to describe animals that are closely related to reindeer. The three most common reindeer relatives are CARIBOU, MOOSE, and ELK. CARIBOU is a 7-letter word for a species of deer native to northern North America and Eurasia. MOOSE is a 5-letter word for the largest extant species in the deer family. ELK is a 3-letter word for a large species of deer native to North America and eastern Asia. All three of these animals are closely related to reindeer and share many of the same characteristics.