ث و یth-w-y
(ض) ثَوٰى يَثْوِيْ ثَوَاءًthawā yathwī thawāʾan: to take up permanent residence in a place, to make one's abode.
ثَاوٍthāw (active participle, ism fāʿil): resident. ﴿وَمَا كُنْتَ ثَاوِيًا فِيْٓ اَهْلِ مَدْيَنَ﴾ (Al-Qaṣaṣ 28:45)
مَثْوًيmathwany (noun of time or place, ẓarf): a place of permanent residence, abode. ﴿اَلَيْسَ فِيْ جَهَنَّمَ مَثْوًي لِّلْمُتَكَبِّرِيْنَ﴾ (Az-Zumar 39:60)