The entrance
pethach  (pay'-thakh)
opening (figuratively) i.e. disclosure -- entrance.
of thy words
dabar  (daw-baw')
a word; by implication, a matter (as spoken of) or thing; adverbially, a cause
giveth light
'owr  (ore)
to be (causative, make) luminous (literally and metaphorically) -- break of day, glorious, kindle, (be, en-, give, show) light (-en, -ened), set on fire, shine.
it giveth understanding
biyn  (bene)
to separate mentally (or distinguish), i.e.(generally) understand
unto the simple
pthiy  (peth-ee')
silly (i.e. seducible) -- foolish, simple(-icity, one).