adder (Hebrew #8207)

Genesis
49:17   Dan
Dan (Hebrew #1835)
judge; Dan, one of the sons of Jacob; also the tribe descended from him, and its territory; likewise a place in Palestine colonized by them
KJV usage: Dan.
Pronounce: dawn
Origin: from 1777
shall be a serpent
nachash (Hebrew #5175)
a snake (from its hiss)
KJV usage: serpent.
Pronounce: naw-khawsh'
Origin: from 5172
by the way
derek (Hebrew #1870)
a road (as trodden); figuratively, a course of life or mode of action, often adverb
KJV usage: along, away, because of, + by, conversation, custom, (east-)ward, journey, manner, passenger, through, toward, (high-) (path-)way(-side), whither(-soever).
Pronounce: deh'-rek
Origin: from 1869
, an adder
shphiyphon (Hebrew #8207)
a kind of serpent (as snapping), probably the cerastes or horned adder
KJV usage: adder.
Pronounce: shef-ee-fone'
Origin: from an unused root meaning the same as 7779
in the path
'orach (Hebrew #734)
a well-trodden road (literally or figuratively); also a caravan
KJV usage: manner, path, race, rank, traveller, troop, (by-, high-)way.
Pronounce: o'-rakh
Origin: from 732
, that biteth
nashak (Hebrew #5391)
to strike with a sting (as a serpent); figuratively, to oppress with interest on a loan
KJV usage: bite, lend upon usury.
Pronounce: naw-shak'
Origin: a primitive root
the horse
cuwc (Hebrew #5483)
from an unused root meaning to skip (properly, for joy); a horse (as leaping); also a swallow (from its rapid flight)
KJV usage: crane, horse((-back, -hoof)). Compare 6571.
Pronounce: soos
Origin: or cuc {soos}
heels
`aqeb (Hebrew #6119)
from 6117; a heel (as protuberant); hence, a track; figuratively, the rear (of an army)
KJV usage: heel, (horse-)hoof, last, lier in wait (by mistake for 6120), (foot- )step.
Pronounce: aw-kabe'
Origin: or (feminine) hiqqbah {ik-keb-aw'}
, so that his rider
rakab (Hebrew #7392)
to ride (on an animal or in a vehicle); causatively, to place upon (for riding or generally), to despatch
KJV usage: bring (on (horse-)back), carry, get (oneself) up, on (horse-)back, put, (cause to, make to) ride (in a chariot, on, -r), set.
Pronounce: raw-kab'
Origin: a primitive root
shall fall
naphal (Hebrew #5307)
to fall, in a great variety of applications (intransitive or causative, literal or figurative)
KJV usage: be accepted, cast (down, self, (lots), out), cease, die, divide (by lot), (let) fail, (cause to, let, make, ready to) fall (away, down, -en, -ing), fell(-ing), fugitive, have (inheritance), inferior, be judged (by mistake for 6419), lay (along), (cause to) lie down, light (down), be (X hast) lost, lying, overthrow, overwhelm, perish, present(-ed, -ing), (make to) rot, slay, smite out, X surely, throw down.
Pronounce: naw-fal'
Origin: a primitive root
backward
'achowr (Hebrew #268)
from 299; the hinder part; hence (adverb) behind, backward; also (as facing north) the West
KJV usage: after(-ward), back (part, -side, -ward), hereafter, (be-)hind(-er part), time to come, without.
Pronounce: aw-khore'
Origin: or (shortened) achor {aw-khore'}
.