There are no genders in Finnish.
The simplest way of dividing the declensions is by the form of the Partitive case.
The first declension has the partitive ending in ta or tä, after a long vowel or diphthong.
The second has the partitive ending in a or ä, after a short vowel.
The third has the partitive in ta or tä, after a consonant.
The First Declension.
This declension includes all words ending in a long vowel or a diphthong.
It has the following characteristics:—
(1) The partitive sing. has the suffix ta or tä, after a long vowel or diphthong.
(2) The nominative sing. is the same as the root.