Four Greek words are translated to some form of the English word "pray".
They are numbered (1189), (2065), (3870), and (4336).
The definitions of these Greek words will be shown below in numerical order, each definition between horizontal lines.

(1189)
1] to want, lack
2] to desire, long for
3] to ask, beg
   3.a] the thing asked for
   3.b] to pray, make supplications
derivation: middle voice of (1210)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=1189&version=kjv

(1210)
1] to bind tie, fasten
   1.a] to bind, fasten with chains, to throw into chains
   1.b] metaph.
       1.b.1] Satan is said to bind a woman bent together by means of a demon, as his messenger, taking possession of the woman and preventing her from standing upright
       1.b.2] to bind, put under obligation, of the law, duty etc.
   1.c] to be bound to one, a wife, a husband
       1.c.1] to forbid, prohibit, declare to be illicit
derivation: a root
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=1210&version=kjv

(2065)
1] to question
2] to ask
   2.a] to request, entreat, beg, beseech
derivation: apparently from (2046) cf (2045)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2065&version=kjv

(2046)
1] to utter, speak, say
derivation:  probably a fuller form of (4483), an alternate for (2036) in certain tenses
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2046&version=kjv

(4483)
1] to pour forth, to utter
derivation:  or certain tenses of which a prolonged form ereo {er-eh'-o}, is used, and both as alternate for (2036), perhaps akin (or identical.) with (4482) (through the idea of pouring forth)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=4483&version=kjv

(2036)
1] to speak, say
derivation: a primary verb (used only in the definite past tense, the others being borrowed from (2046 above), (4483 above), and (5346))
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2036&version=kjv 

(4482)
1] to flow
derivation: a primary verb
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=4482&version=kjv

(5346)
1] to make known one's thoughts, to declare
2] to say
derivation: properly, the same as the base of (5457) and (5316)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=5346&version=kjv

(5457)
1] light
   1.a] the light
       1.a.1] emitted by a lamp
       1.a.2] a heavenly light such as surrounds angels when they appear on earth
   1.b] anything emitting light
       1.b.1] a star
       1.b.2] fire because it is light and sheds light
       1.b.3] a lamp or torch
   1.c] light, i.e. brightness
       1.c.1] of a lamp
2] metaph.
   2.a] God is light because light has the extremely delicate, subtle, pure, brilliant quality
   2.b] of truth and its knowledge, together with the spiritual purity associated with it
   2.c] that which is exposed to the view of all, openly, publicly
   2.d] reason, mind
       2.d.1] the power of understanding esp. moral and spiritual truth
derivation: from an obsolete phao (to shine or make manifest, especially by rays, cf (5316), (5346 above))
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=5457&version=kjv

(5316)
1] to bring forth into the light, cause to shine, shed light
2] shine
   2.a] to shine, be bright or resplendent
   2.b] to become evident, to be brought forth into the light, come to view, appear
       2.b.1] of growing vegetation, to come to light
       2.b.2] to appear, be seen
       2.b.3] exposed to view
   2.c] to meet the eyes, strike the sight, become clear or manifest
       2.c.1] to be seen, appear
   2.d] to appear to the mind, seem to one's judgment or opinion
derivation: prolongation for the base of (5457 above)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=5316&version=kjv

(2045)
1] to search, examine into
derivation:  apparently from (2046 above) (through the idea of enquiry)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2045&version=kjv

(3870)
1] to call to one's side, call for, summon
2] to address, speak to, (call to, call upon), which may be done in the way of exhortation, entreaty, comfort, instruction, etc.
   2.a] to admonish, exhort
   2.b] to beg, entreat, beseech
       2.b.1] to strive to appease by entreaty
   2.c] to console, to encourage and strengthen by consolation, to comfort
       2.c.1] to receive consolation, be comforted
   2.d] to encourage, strengthen
   2.e] exhorting and comforting and encouraging
   2.f] to instruct, teach
derivation: from (3844) and (2564)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=3870&version=kjv

(3844)
1] from, of at, by, besides, near
derivation: a root word
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=3844&version=kjv

(2564)
1] to call
   1.a] to call aloud, utter in a loud voice
   1.b] to invite
2] to call i.e. to name, by name
   2.a] to give a name to
       2.a.1] to receive the name of, receive as a name
       2.a.2] to give some name to one, call his name
   2.b] to be called i.e. to bear a name or title (among men)
   2.c] to salute one by name
derivation: akin to the base of (2753)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2564&version=kjv

(2753)
1] to command, to order
derivation: from a primary kello (to urge on)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2753&version=kjv

(4336)
1] to offer prayers, to pray
derivation: from (4314) and (2172)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=4336&version=kjv

(4314)
1] to the advantage of
2] at, near, by
3] to, towards, with, with regard to
derivation: a strengthened form of (4253)
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=4314&version=kjv

(4253)
1] before
derivation: a primary preposition
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=4253&version=kjv

(2172)
1] to pray to God
2] to wish, to pray, to pray for
derivation: middle voice of a primary verb
http://bible1.crosswalk.com/Lexicons/Greek/grk.cgi?number=2172&version=kjv