The final radical of this word is guttural; this affects the adjacent vowels.
Singular
Plural
Masculine
Feminine
Masculine
Feminine
טִבְעוֹנִי
tiv'oni
vegan
טִבְעוֹנִית
tiv'onit
vegan
טִבְעוֹנִיִּים
tiv'oniyim
vegan
טִבְעוֹנִיּוֹת
tiv'oniyot
vegan
Singular
Masculine
טִבְעוֹנִי
tiv'oni
vegan
Feminine
טִבְעוֹנִית
tiv'onit
vegan
Plural
Masculine
טִבְעוֹנִיִּים
tiv'oniyim
vegan
Feminine
טִבְעוֹנִיּוֹת
tiv'oniyot
vegan