Question

which of the terms below uses a hyphen to create a compound word:
dogs leash
merry-go-round
-ous
happine

Explanation:

A compound word combines two or more words into one. "merry-go-round" uses hyphens to join three words into a single compound noun referring to an amusement ride. "dog's leash" uses an apostrophe for possession, "-ous" is a suffix, and "happine" is an incomplete word.

Answer:

merry-go-round