Which word does not belong to others?

Inch
Kilogram
Centimeter
Yard
Kilogram.

Although there is metric and imperial units in this list, and that could be a valid separation of items - only a single item can be removed. Thusly, a grouping of unit types, as opposed to unit system, is more applicable. As kilogram is a unit of mass, whilst the remaining three are units of distance, in some sense the word Kilogram does not belong to the others, where the others is considered to be a subset of words measuring distance.

If this assumption is incorrect, please clarify with either more entries in rejected or accepted words, or provide context upon which a further analysis can be made. In this example the context would be measurement terms whilst another may potentially be word length where another possible (although contrived) solution is that Kilogram is excluded as it's length is odd, when the word length is taken mod 5.

If you would like me to make another guess without information I am happy to! However I can't make promises about the accuracy.