The word bored sounds like the word board. these words are called
a) antonyms.
b) synonyms.
c) compounds.
d) homophones.

D). Homophones.

Explanation:

Homophones are those words that have different spellings, words or even meanings but their sounds, their pronunciations are the same. There are lots of words in the English vocabulary that are homophones, and so it is easy to misunderstand or even mistake one thing for the other. Like for example, the word 'bored' sounds the same as 'board' but they have absolutely nothing in common, nor do they mean the same thing. Common other examples are 'cell-sell', 'blue-blew', 'hour-our', 'know-no' etc.