jutsi -jut- gismu

x1 is a species of genus x2, family x3, etc.; [open-ended tree-structure categorization].

Also subspecies, order, phylum; (places do not correspond to specific levels in the hierarchy; rather, x1 is at a "lower" or "bushier" part of the tree than x2, x2 is "lower" than x3, etc.; skipping a place thus means that there is one or more known-and-unspecified levels of hierarchy between the two); not limited to Linnean animal/plant taxonomy. See also klesi, lanzu.

In notes:

x1 (mass/si'o) is a class/category/subgroup/subset within x2 with defining property x3 (ka).
x1 (mass) is a family with members including x2 bonded/tied/joined according to standard x3.
k1=jm1=ji3 is a phylum [animals]/division [plants] within/of kingdom [biology] k2=ji2.
k1=jm1=ji3 is a kingdom [biology] of domain [biology] k2.
x1 is a Linnaean order, between family and class