Sentence:  What we have left as reasonably comparable are four <WSD>classes</WSD> : ( 1 ) body parts and products , which with a proportionally nearly even representation ( 51 terms out of 253 , 25 out of 100 ) come out with nearly even ratios ; 2.6 and 2.7 ; ( 2 ) Nature ( 29 terms against 17 ) , ratios 3.3 versus 4.1 ; ( 3 ) adjectives ( 16 , 15 terms ) , ratios 3.9 versus 4.7 ; ( 4 ) verbs ( 9 , 22 terms ) , ratios 4.0 versus 3.4 . 
Meaning of the word marked with <WSD> tags:  a collection of things sharing a common attribute