stab vs straight thrust

stab and straight thrust both are nouns.

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

As nouns, straight thrust is a hyponym of stab; that is, straight thrust is a word with a more specific, narrower meaning than stab:

stab: a strong blow with a knife or other sharp pointed instrument
straight thrust: (fencing) an attacking thrust made with one foot forward and the back leg straight and with the sword arm outstretched forward

Other hyponyms of stab include lunge, passado, remise.

stab (noun)	straight thrust (noun)
a strong blow with a knife or other sharp pointed instrument	(fencing) an attacking thrust made with one foot forward and the back leg straight and with the sword arm outstretched forward
informal words for any attempt or effort
a sudden sharp feeling