ינשוף Yanshuf
Every verse in which this word stands — 3 places, in canonical order, first appearance to last. These are the places the lexicon carries under this word's own entry, counting every form the text writes it in, which is the number on the list.
In both kosher lists, and haunting Edom's ruin in Yeshayahu 34:11. Traditionally an owl, named for the twilight or for its cry; the identification is discussed.
וְאֶת־הַכּוֹס וְאֶת־הַשָּׁלָךְ וְאֶת־הַיַּנְשֽׁוּף
and the little owl, and the cormorant, and the great owl;
אֶת־הַכּוֹס וְאֶת־הַיַּנְשׁוּף וְהַתִּנְשָֽׁמֶת
the little owl, and the great owl, and the horned owl;
וִירֵשׁוּהָ קָאַת וְקִפּוֹד וְיַנְשׁוֹף וְעֹרֵב יִשְׁכְּנוּ־בָהּ וְנָטָה עָלֶיהָ קַֽו־תֹהוּ וְאַבְנֵי־בֹֽהוּ
But the pelican and the bittern shall possess it, And the owl and the raven shall dwell therein; And He shall stretch over it The line of confusion, and the plummet of emptiness.
Quick answers
What is the Hebrew word for yanshuf?
Yanshuf in Hebrew is ינשוף, with a gematria of 446 in the standard method.
How many times is the yanshuf mentioned in the Tanakh?
The word stands 3 times in the Tanakh, first at Leviticus 11:17.
A spelling is not a word. The corpus never writes ינשוף bare — every one of its places carries a particle or a suffix on the front or the back — so the spelling above is the word's own headword, and the verses listed here are the only door to it.