sub·king·dom 
(sŭbkĭng′dəm)
(sŭbkĭng′dəm)n.
A taxonomic category of related organisms constituting a major division of a kingdom.
- highboy
- highbred
- highbrow
- highbrowism
- highbush blueberry
- highbush cranberry
- highchair
- High-Church
- high-class
- high comedy
- high command
- high commissioner
- high-concept
- high-count
- high court
- high-def
- high definition
- high-definition
- high-density lipoprotein
- high-density polyethylene
- high-end
- high-energy
- higher critic
- higher criticism
- higher education