second fiddle vs subnormal

second fiddle

• A sidekick or subordinate, or the role of such a person. 

• The person playing second fiddle. 

• A fiddle part in harmony to the first fiddle. 

subnormal

• A person whose abilities are less than normal. 

• That part of the axis of a curved line which is intercepted between the ordinate and the normal. 

• denormal 

• Less than normal.