Types of words

Synonyms: 

         Word meaning same as another

Homonym: 

         With same spelling or sound

Heteronym: 

         Similarly spelled word

Acronym: 

         Word formed from initials

Antonym: 

         Word with opposite meaning

Onomatopoeic: 

         The sound of imitation associated with the action or thing denoted by a word

Palindrome: 

         A number, word, phrase Or passage that reads the same forward and backward.

Doublet:  

         Word with same root as another. Either of two similar words in a language that have same historical root but have arrived at their current forms via different language