Declension table of mantri

Masculine	Singular	Dual	Plural
Nominative	mantriḥ	mantrī	mantrayaḥ
Vocative	mantre	mantrī	mantrayaḥ
Accusative	mantrim	mantrī	mantrīn
Instrumental	mantriṇā	mantribhyām	mantribhiḥ
Dative	mantraye	mantribhyām	mantribhyaḥ
Ablative	mantreḥ	mantribhyām	mantribhyaḥ
Genitive	mantreḥ	mantryoḥ	mantrīṇām
Locative	mantrau	mantryoḥ	mantriṣu

Compound mantri -

Adverb -mantri