Turkish colour names boz and kır are usually used synonymously and interchangeably in dictionaries to explain semantic properties of one another. In order to identify points of intersection and differentiation between the two terms, in this article, semantic, conceptual and morphological fields of these two colour names have been examined. The colour name boz is used more frequently and widely than the colour term kır. While the colour name boz appears to collocate with many different concepts from different fields, the use of the colour name kır seems to be limited to concepts related to hair, such as hair and beard, and natural events. The conceptual fields of these two terms also seem to intersect in contemporary branches of Turkish. These two terms seem to have an overlapping semantic denotation while they seem to differ in terms of their connotative and figurative meanings.