1) Deluge 2) Fill 3) Fill quickly beyond capacity 4) Fill up 5) Flood 6) Flood cover by overflowing 7) Flood or engulf 8) Make full 9) Overwhelm 10) Overwhelm with a flood 11) Overwhelm;flood; submerge 12) Submerge 13) Swamp 14) To flood 15) To overwhelm Found on https://www.crosswordclues.com/clue/inundate
• (v. t.) To cover with a flood; to overflow; to deluge; to flood; as, the river inundated the town. • (v. t.) To fill with an overflowing abundance or superfluity; as, the country was inundated with bills of credit. Found on http://thinkexist.com/dictionary/meaning/inundate/
In·un'date transitive verb [ imperfect & past participle Inundated ; present participle & verbal noun Inundating .] [ Latin inundatus , past participle of inundare to inundate; prefix in- in + undare to rise... Found on http://www.encyclo.co.uk/webster/I/90