This paper investigates whether there is a correlation between semantic relations and word formation, and if there is, how it works. Semantic relations refers to synonym, oppositeness, hyponymy and homonymy. Word association is also considered and oppositeness can be divided into antonym, complementary and converse. After selecting word pairs from each of the semantic relations according to certain criteria, I look into word formation patterns of two words which consist of one pair and investigate whether there are any connections between them. Finally, I derive some interesting results from this observation; the closer in meaning between the two words, the similar the word formation patterns. The degree of similarity is as follows; synonym > complementary > antonym≒hyponymy > converse > word association > homonymy. This result ultimately implies that the connection between meaning and form is not always arbitrary.
