Balls and Backbone

Backbone and balls are semantically related in bravery topic. In some cases you can use "Backbone" instead a noun "Balls".

Backbone noun - A column of bones supporting the trunk of a vertebrate animal.

Balls and backbone are semantically related in strength of character topic. You can use "Balls" instead a noun "Backbone", if it concerns topics such as vulgar slang.

Nearby Word: backboned