|Kotus type 25 (toimi)||NSK types 35–37 (lumi, tuomi and niemi)|
Two-syllable nominals ending with ⟨-mi⟩; no consonant gradation.
Declension is similar to type 24 (uni). Inflectional stem replaces ⟨-i⟩ with ⟨-e-⟩. ⟨-e-⟩ of stem dropped before plural marker ⟨-i-⟩.
If the partitive singular ending ⟨-ta⟩/⟨-tä⟩ or genitive plural ⟨-ten⟩ are attached to the basic stem, the ⟨-m-⟩ becomes ⟨-n-⟩. Alternatively, partitive singular ⟨-a-⟩/⟨-ä⟩ and genitive plural ending ⟨-en⟩ on the inflectional stem are accepted. Partitive plural ending ⟨-a⟩/⟨-ä⟩.