stab vs knife thrust

stab and knife thrust both are nouns.

Word	Noun	Adjective	Verb	Adverb
stab	Yes	No	Yes	No
knife thrust	Yes	No	No	No

As nouns, stab and knife thrust are synonyms defined as:

stab and knife thrust: a strong blow with a knife or other sharp pointed instrument

Other synonyms of stab include thrust.

stab (noun)	knife thrust (noun)
a strong blow with a knife or other sharp pointed instrument	a strong blow with a knife or other sharp pointed instrument
informal words for any attempt or effort
a sudden sharp feeling