Affix
A prefix or suffix
Acronym*
A word made from first letters
Coinage*
An invented word
Colloquial*
Conversational
Diminutive
A suffix indicating smallness
Metonymy
The use of a closely related word as a substitute
Oxymoron*
An expression with contradictory words
Palindrome
A word spelled the same backward and forward
Portmanteau word
A word formed from two other words
Spoonerism
A comical switching of the first sounds of words