than : (conj.) expressed by the abl. and suffix -tara. more than that, tato bahutaraṃ.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

nas

[translation-eng] {Hopkins} (1) ablative particle: from; than (2) barley

example

• [bod] nas dang las gnyis 'byung khungs dang
• [eng] the two -- nas and las -- are the ablative particles{Y}

Jeffrey Hopkins' Tibetan-Sanskrit-English Dictionary