ratcu gismu

x1 is a rat of species/breed x2.

See also smacu.

In notes:

smacu
x1 is a mouse of species/breed x2.
ronte
x1 is a rodent [can be a member of eutherian mammal Rodentia; semantic broadening might subjectively generalize the concept somewhat] of subtaxon/type/genus/species/breed/variety x2
sengi
x1 is an elephant shrew/jumping shrew/sengi (member of Afrotherian mammal order: Macroscelidea) of subtaxon/type/genus/species/variety/breed x2
dalrodente
x1 is a rodent of species x2
dalsauia
x1 is a guinea pig of species x2
kriketinai
x1 is a hamster/member of rodent subfamily Cricetinae of sub-taxon/genus/species/type/breed x2
marmota
x1 is a marmot/woodchuck/groundhog of species x2.
ratmacu
x1 is a mouse/rat (family Muridae) of species/breed x2
ratcnrodentia
x1 is a rodent [member of eutherian mammal Rodentia] of subtaxon/type/genus/species/breed/variety x2
rontnrodentia
x1 is a rodent [can only be a member of eutherian mammal Rodentia] of subtaxon/type/genus/species/breed/variety x2