Small monkey is a term used to describe four different species of primates. The first is the MARMOSET, which is an 8-letter word and is a small, squirrel-like monkey found in South America. The second is the titi, which is a 4-letter word and is a small, long-tailed monkey found in South America. The third is the LEMUR, which is a 5-letter word and is a small, nocturnal primate found in Madagascar. The fourth is the MONA, which is a 4-letter word and is a small, arboreal monkey found in the Caribbean.