Onomasiology can be carried out synchronically or diachronically, i.e. historically. It can also be used to refer to Mongolia synchronically. Nawat has a perfect in "-tuk" (synchronically unanalyzable), plural "-tiwit". When jackrabbit numbers crash, red-tailed hawk productivity tends to decline synchronically. This work focussed on African languages synchronically from the point of view of grammaticalization. These originally belonged to the third declension, but synchronically are best regarded as separate declensions. Such verbs appear synchronically to be a mixture of accent paradigms "a" and "c".