Sentence:  He has announced results on Hokan , Penutian , Uto-Aztecan , and almost all other American families and phyla , and has diagrammed their degree of <WSD>interrelation</WSD> ; but he has not worked out by lexicostatistics one comprehensively complete classification of even a single family other than Salish . 
Meaning of the word marked with <WSD> tags:  mutual or reciprocal relation or relatedness