thrust vs thrust ahead

thrust is a noun but thrust ahead is not a noun.

Word	Noun	Adjective	Verb	Adverb
thrust	Yes	No	Yes	No
thrust ahead	No	No	Yes	No

thrust (noun)	thrust ahead (noun)
the act of applying force to propel something
a strong blow with a knife or other sharp pointed instrument
a sharp hand gesture (resembling a blow)
verbal criticism
the force used in pushing

thrust (verb)	thrust ahead (verb)
impose urgently, importunately, or inexorably	push one's way
penetrate or cut through with a sharp instrument
place or put with great energy
push forcefully
make a thrusting forward movement
press or force
push violently in a specified direction
force (molten rock) into pre-existing rock