Bible Greek and Hebrew Dictionaries combined for Word Studies
Genesis Chapter 1
whale 2785 # ketos {kay'-tos}; probably from the base of 5490; a huge fish (as gaping for prey): -- {whale}.
whale 8565 ## tan {tan}; from an unused root probably meaning to elongate; a monster (as preternaturally formed), i.e. a sea-serpent (or other huge marine animal); also a jackal (or other hideous land animal): -- dragon, {whale}. Compare 8577.
whale 8577 ## tanniyn {tan-neen'}; or tanniym (Ezek. 29:3) {tan-neem'}; intensive from the same as 8565; a marine or land monster, i.e. sea-serpent or jackal: -- dragon, sea-monster, serpent, {whale}.