And he shall cut down
naqaph  (naw-kaf')
to strike with more or less violence (beat, fell, corrode); by implication (of attack) to knock together, i.e. surround or circulate
the thickets
cbak  (seb-awk')
of the forest
ya`ar  (yah'-ar)
a copse of bushes; hence, a forest; hence, honey in the comb (as hived in trees) -- (honey-)comb, forest, wood.
with iron
barzel  (bar-zel')
iron (as cutting); by extension, an iron implement -- (ax) head, iron.
and Lebanon
Lbanown  (leb-aw-nohn')
(the) white mountain (from its snow); Lebanon, a mountain range in Palestine -- Lebanon.
shall fall
naphal  (naw-fal')
to fall, in a great variety of applications (intransitive or causative, literal or figurative)
by a mighty one
'addiyr  (ad-deer')
wide or (generally) large; figuratively, powerful -- excellent, famous, gallant, glorious, goodly, lordly, mighty(-ier one), noble, principal, worthy.